Simplify 1/((x-3)^2)-2/(x^2-9)+1/((x+3)^2)

$\frac{1}{{(x - 3)}^{2}} - \frac{2}{x^{2} - 9} + \frac{1}{{(x + 3)}^{2}}$

Find the common denominator.

Multiply $\frac{1}{{(x - 3)}^{2}}$ by $\frac{(x^{2} - 9) {(x + 3)}^{2}}{(x^{2} - 9) {(x + 3)}^{2}}$ .

$\frac{1}{{(x - 3)}^{2}} \cdot \frac{(x^{2} - 9) {(x + 3)}^{2}}{(x^{2} - 9) {(x + 3)}^{2}} - \frac{2}{x^{2} - 9} + \frac{1}{{(x + 3)}^{2}}$

Multiply $\frac{1}{{(x - 3)}^{2}}$ by $\frac{(x^{2} - 9) {(x + 3)}^{2}}{(x^{2} - 9) {(x + 3)}^{2}}$ .

$\frac{(x^{2} - 9) {(x + 3)}^{2}}{{(x - 3)}^{2} ((x^{2} - 9) {(x + 3)}^{2})} - \frac{2}{x^{2} - 9} + \frac{1}{{(x + 3)}^{2}}$

Multiply $\frac{2}{x^{2} - 9}$ by $\frac{{(x - 3)}^{2} {(x + 3)}^{2}}{{(x - 3)}^{2} {(x + 3)}^{2}}$ .

$\frac{(x^{2} - 9) {(x + 3)}^{2}}{{(x - 3)}^{2} ((x^{2} - 9) {(x + 3)}^{2})} - (\frac{2}{x^{2} - 9} \cdot \frac{{(x - 3)}^{2} {(x + 3)}^{2}}{{(x - 3)}^{2} {(x + 3)}^{2}}) + \frac{1}{{(x + 3)}^{2}}$

Multiply $\frac{2}{x^{2} - 9}$ by $\frac{{(x - 3)}^{2} {(x + 3)}^{2}}{{(x - 3)}^{2} {(x + 3)}^{2}}$ .

$\frac{(x^{2} - 9) {(x + 3)}^{2}}{{(x - 3)}^{2} ((x^{2} - 9) {(x + 3)}^{2})} - \frac{2 ({(x - 3)}^{2} {(x + 3)}^{2})}{(x^{2} - 9) ({(x - 3)}^{2} {(x + 3)}^{2})} + \frac{1}{{(x + 3)}^{2}}$

Multiply $\frac{1}{{(x + 3)}^{2}}$ by $\frac{(x^{2} - 9) {(x - 3)}^{2}}{(x^{2} - 9) {(x - 3)}^{2}}$ .

$\frac{(x^{2} - 9) {(x + 3)}^{2}}{{(x - 3)}^{2} ((x^{2} - 9) {(x + 3)}^{2})} - \frac{2 ({(x - 3)}^{2} {(x + 3)}^{2})}{(x^{2} - 9) ({(x - 3)}^{2} {(x + 3)}^{2})} + \frac{1}{{(x + 3)}^{2}} \cdot \frac{(x^{2} - 9) {(x - 3)}^{2}}{(x^{2} - 9) {(x - 3)}^{2}}$

Multiply $\frac{1}{{(x + 3)}^{2}}$ by $\frac{(x^{2} - 9) {(x - 3)}^{2}}{(x^{2} - 9) {(x - 3)}^{2}}$ .

$\frac{(x^{2} - 9) {(x + 3)}^{2}}{{(x - 3)}^{2} ((x^{2} - 9) {(x + 3)}^{2})} - \frac{2 ({(x - 3)}^{2} {(x + 3)}^{2})}{(x^{2} - 9) ({(x - 3)}^{2} {(x + 3)}^{2})} + \frac{(x^{2} - 9) {(x - 3)}^{2}}{{(x + 3)}^{2} ((x^{2} - 9) {(x - 3)}^{2})}$

Reorder the factors of ${(x - 3)}^{2} ((x^{2} - 9) {(x + 3)}^{2})$ .

$\frac{(x^{2} - 9) {(x + 3)}^{2}}{{(x + 3)}^{2} {(x - 3)}^{2} (x^{2} - 9)} - \frac{2 ({(x - 3)}^{2} {(x + 3)}^{2})}{(x^{2} - 9) ({(x - 3)}^{2} {(x + 3)}^{2})} + \frac{(x^{2} - 9) {(x - 3)}^{2}}{{(x + 3)}^{2} ((x^{2} - 9) {(x - 3)}^{2})}$

Reorder the factors of $(x^{2} - 9) ({(x - 3)}^{2} {(x + 3)}^{2})$ .

$\frac{(x^{2} - 9) {(x + 3)}^{2}}{{(x + 3)}^{2} {(x - 3)}^{2} (x^{2} - 9)} - \frac{2 ({(x - 3)}^{2} {(x + 3)}^{2})}{{(x + 3)}^{2} {(x - 3)}^{2} (x^{2} - 9)} + \frac{(x^{2} - 9) {(x - 3)}^{2}}{{(x + 3)}^{2} ((x^{2} - 9) {(x - 3)}^{2})}$

Reorder the factors of ${(x + 3)}^{2} ((x^{2} - 9) {(x - 3)}^{2})$ .

Simplify terms.

Combine the numerators over the common denominator.

$\frac{(x^{2} - 9) {(x + 3)}^{2} - 2 ({(x - 3)}^{2} {(x + 3)}^{2}) + (x^{2} - 9) {(x - 3)}^{2}}{{(x + 3)}^{2} {(x - 3)}^{2} (x^{2} - 9)}$

Simplify each term.

Rewrite ${(x + 3)}^{2}$ as $(x + 3) (x + 3)$ .

$\frac{(x^{2} - 9) ((x + 3) (x + 3)) - 2 ({(x - 3)}^{2} {(x + 3)}^{2}) + (x^{2} - 9) {(x - 3)}^{2}}{{(x + 3)}^{2} {(x - 3)}^{2} (x^{2} - 9)}$

Expand $(x + 3) (x + 3)$ using the FOIL Method.

Apply the distributive property.

$\frac{(x^{2} - 9) (x (x + 3) + 3 (x + 3)) - 2 ({(x - 3)}^{2} {(x + 3)}^{2}) + (x^{2} - 9) {(x - 3)}^{2}}{{(x + 3)}^{2} {(x - 3)}^{2} (x^{2} - 9)}$

Apply the distributive property.

$\frac{(x^{2} - 9) (x \cdot x + x \cdot 3 + 3 (x + 3)) - 2 ({(x - 3)}^{2} {(x + 3)}^{2}) + (x^{2} - 9) {(x - 3)}^{2}}{{(x + 3)}^{2} {(x - 3)}^{2} (x^{2} - 9)}$

Apply the distributive property.

$\frac{(x^{2} - 9) (x \cdot x + x \cdot 3 + 3 x + 3 \cdot 3) - 2 ({(x - 3)}^{2} {(x + 3)}^{2}) + (x^{2} - 9) {(x - 3)}^{2}}{{(x + 3)}^{2} {(x - 3)}^{2} (x^{2} - 9)}$

Simplify and combine like terms.

Simplify each term.

Multiply $x$ by $x$ .

$\frac{(x^{2} - 9) (x^{2} + x \cdot 3 + 3 x + 3 \cdot 3) - 2 ({(x - 3)}^{2} {(x + 3)}^{2}) + (x^{2} - 9) {(x - 3)}^{2}}{{(x + 3)}^{2} {(x - 3)}^{2} (x^{2} - 9)}$

Move $3$ to the left of $x$ .

$\frac{(x^{2} - 9) (x^{2} + 3 \cdot x + 3 x + 3 \cdot 3) - 2 ({(x - 3)}^{2} {(x + 3)}^{2}) + (x^{2} - 9) {(x - 3)}^{2}}{{(x + 3)}^{2} {(x - 3)}^{2} (x^{2} - 9)}$

Multiply $3$ by $3$ .

$\frac{(x^{2} - 9) (x^{2} + 3 x + 3 x + 9) - 2 ({(x - 3)}^{2} {(x + 3)}^{2}) + (x^{2} - 9) {(x - 3)}^{2}}{{(x + 3)}^{2} {(x - 3)}^{2} (x^{2} - 9)}$

Add $3 x$ and $3 x$ .

$\frac{(x^{2} - 9) (x^{2} + 6 x + 9) - 2 ({(x - 3)}^{2} {(x + 3)}^{2}) + (x^{2} - 9) {(x - 3)}^{2}}{{(x + 3)}^{2} {(x - 3)}^{2} (x^{2} - 9)}$

Expand $(x^{2} - 9) (x^{2} + 6 x + 9)$ by multiplying each term in the first expression by each term in the second expression.

$\frac{x^{2} x^{2} + x^{2} (6 x) + x^{2} \cdot 9 - 9 x^{2} - 9 (6 x) - 9 \cdot 9 - 2 ({(x - 3)}^{2} {(x + 3)}^{2}) + (x^{2} - 9) {(x - 3)}^{2}}{{(x + 3)}^{2} {(x - 3)}^{2} (x^{2} - 9)}$

Combine the opposite terms in $x^{2} x^{2} + x^{2} (6 x) + x^{2} \cdot 9 - 9 x^{2} - 9 (6 x) - 9 \cdot 9$ .

Reorder the factors in the terms $x^{2} \cdot 9$ and $- 9 x^{2}$ .

$\frac{x^{2} x^{2} + x^{2} (6 x) + 9 x^{2} - 9 x^{2} - 9 (6 x) - 9 \cdot 9 - 2 ({(x - 3)}^{2} {(x + 3)}^{2}) + (x^{2} - 9) {(x - 3)}^{2}}{{(x + 3)}^{2} {(x - 3)}^{2} (x^{2} - 9)}$

Subtract $9 x^{2}$ from $9 x^{2}$ .

$\frac{x^{2} x^{2} + x^{2} (6 x) + 0 - 9 (6 x) - 9 \cdot 9 - 2 ({(x - 3)}^{2} {(x + 3)}^{2}) + (x^{2} - 9) {(x - 3)}^{2}}{{(x + 3)}^{2} {(x - 3)}^{2} (x^{2} - 9)}$

Add $x^{2} x^{2} + x^{2} (6 x)$ and $0$ .

$\frac{x^{2} x^{2} + x^{2} (6 x) - 9 (6 x) - 9 \cdot 9 - 2 ({(x - 3)}^{2} {(x + 3)}^{2}) + (x^{2} - 9) {(x - 3)}^{2}}{{(x + 3)}^{2} {(x - 3)}^{2} (x^{2} - 9)}$

Simplify each term.

Multiply $x^{2}$ by $x^{2}$ by adding the exponents.

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$\frac{x^{2 + 2} + x^{2} (6 x) - 9 (6 x) - 9 \cdot 9 - 2 ({(x - 3)}^{2} {(x + 3)}^{2}) + (x^{2} - 9) {(x - 3)}^{2}}{{(x + 3)}^{2} {(x - 3)}^{2} (x^{2} - 9)}$

Add $2$ and $2$ .

$\frac{x^{4} + x^{2} (6 x) - 9 (6 x) - 9 \cdot 9 - 2 ({(x - 3)}^{2} {(x + 3)}^{2}) + (x^{2} - 9) {(x - 3)}^{2}}{{(x + 3)}^{2} {(x - 3)}^{2} (x^{2} - 9)}$

Rewrite using the commutative property of multiplication.

$\frac{x^{4} + 6 x^{2} x - 9 (6 x) - 9 \cdot 9 - 2 ({(x - 3)}^{2} {(x + 3)}^{2}) + (x^{2} - 9) {(x - 3)}^{2}}{{(x + 3)}^{2} {(x - 3)}^{2} (x^{2} - 9)}$

Multiply $x^{2}$ by $x$ by adding the exponents.

Move $x$ .

$\frac{x^{4} + 6 (x \cdot x^{2}) - 9 (6 x) - 9 \cdot 9 - 2 ({(x - 3)}^{2} {(x + 3)}^{2}) + (x^{2} - 9) {(x - 3)}^{2}}{{(x + 3)}^{2} {(x - 3)}^{2} (x^{2} - 9)}$

Multiply $x$ by $x^{2}$ .

Raise $x$ to the power of $1$ .

$\frac{x^{4} + 6 (x^{1} x^{2}) - 9 (6 x) - 9 \cdot 9 - 2 ({(x - 3)}^{2} {(x + 3)}^{2}) + (x^{2} - 9) {(x - 3)}^{2}}{{(x + 3)}^{2} {(x - 3)}^{2} (x^{2} - 9)}$

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$\frac{x^{4} + 6 x^{1 + 2} - 9 (6 x) - 9 \cdot 9 - 2 ({(x - 3)}^{2} {(x + 3)}^{2}) + (x^{2} - 9) {(x - 3)}^{2}}{{(x + 3)}^{2} {(x - 3)}^{2} (x^{2} - 9)}$

Add $1$ and $2$ .

$\frac{x^{4} + 6 x^{3} - 9 (6 x) - 9 \cdot 9 - 2 ({(x - 3)}^{2} {(x + 3)}^{2}) + (x^{2} - 9) {(x - 3)}^{2}}{{(x + 3)}^{2} {(x - 3)}^{2} (x^{2} - 9)}$

Multiply $6$ by $- 9$ .

$\frac{x^{4} + 6 x^{3} - 54 x - 9 \cdot 9 - 2 ({(x - 3)}^{2} {(x + 3)}^{2}) + (x^{2} - 9) {(x - 3)}^{2}}{{(x + 3)}^{2} {(x - 3)}^{2} (x^{2} - 9)}$

Multiply $- 9$ by $9$ .

$\frac{x^{4} + 6 x^{3} - 54 x - 81 - 2 ({(x - 3)}^{2} {(x + 3)}^{2}) + (x^{2} - 9) {(x - 3)}^{2}}{{(x + 3)}^{2} {(x - 3)}^{2} (x^{2} - 9)}$

Rewrite ${(x - 3)}^{2}$ as $(x - 3) (x - 3)$ .

$\frac{x^{4} + 6 x^{3} - 54 x - 81 - 2 ((x - 3) (x - 3) {(x + 3)}^{2}) + (x^{2} - 9) {(x - 3)}^{2}}{{(x + 3)}^{2} {(x - 3)}^{2} (x^{2} - 9)}$

Expand $(x - 3) (x - 3)$ using the FOIL Method.

Apply the distributive property.

$\frac{x^{4} + 6 x^{3} - 54 x - 81 - 2 ((x (x - 3) - 3 (x - 3)) {(x + 3)}^{2}) + (x^{2} - 9) {(x - 3)}^{2}}{{(x + 3)}^{2} {(x - 3)}^{2} (x^{2} - 9)}$

Apply the distributive property.

$\frac{x^{4} + 6 x^{3} - 54 x - 81 - 2 ((x \cdot x + x \cdot - 3 - 3 (x - 3)) {(x + 3)}^{2}) + (x^{2} - 9) {(x - 3)}^{2}}{{(x + 3)}^{2} {(x - 3)}^{2} (x^{2} - 9)}$

Apply the distributive property.

$\frac{x^{4} + 6 x^{3} - 54 x - 81 - 2 ((x \cdot x + x \cdot - 3 - 3 x - 3 \cdot - 3) {(x + 3)}^{2}) + (x^{2} - 9) {(x - 3)}^{2}}{{(x + 3)}^{2} {(x - 3)}^{2} (x^{2} - 9)}$

Simplify and combine like terms.

Simplify each term.

Multiply $x$ by $x$ .

$\frac{x^{4} + 6 x^{3} - 54 x - 81 - 2 ((x^{2} + x \cdot - 3 - 3 x - 3 \cdot - 3) {(x + 3)}^{2}) + (x^{2} - 9) {(x - 3)}^{2}}{{(x + 3)}^{2} {(x - 3)}^{2} (x^{2} - 9)}$

Move $- 3$ to the left of $x$ .

$\frac{x^{4} + 6 x^{3} - 54 x - 81 - 2 ((x^{2} - 3 \cdot x - 3 x - 3 \cdot - 3) {(x + 3)}^{2}) + (x^{2} - 9) {(x - 3)}^{2}}{{(x + 3)}^{2} {(x - 3)}^{2} (x^{2} - 9)}$

Multiply $- 3$ by $- 3$ .

$\frac{x^{4} + 6 x^{3} - 54 x - 81 - 2 ((x^{2} - 3 x - 3 x + 9) {(x + 3)}^{2}) + (x^{2} - 9) {(x - 3)}^{2}}{{(x + 3)}^{2} {(x - 3)}^{2} (x^{2} - 9)}$

Subtract $3 x$ from $- 3 x$ .

$\frac{x^{4} + 6 x^{3} - 54 x - 81 - 2 ((x^{2} - 6 x + 9) {(x + 3)}^{2}) + (x^{2} - 9) {(x - 3)}^{2}}{{(x + 3)}^{2} {(x - 3)}^{2} (x^{2} - 9)}$

Rewrite ${(x + 3)}^{2}$ as $(x + 3) (x + 3)$ .

$\frac{x^{4} + 6 x^{3} - 54 x - 81 - 2 ((x^{2} - 6 x + 9) ((x + 3) (x + 3))) + (x^{2} - 9) {(x - 3)}^{2}}{{(x + 3)}^{2} {(x - 3)}^{2} (x^{2} - 9)}$

Expand $(x + 3) (x + 3)$ using the FOIL Method.

Apply the distributive property.

$\frac{x^{4} + 6 x^{3} - 54 x - 81 - 2 ((x^{2} - 6 x + 9) (x (x + 3) + 3 (x + 3))) + (x^{2} - 9) {(x - 3)}^{2}}{{(x + 3)}^{2} {(x - 3)}^{2} (x^{2} - 9)}$

Apply the distributive property.

$\frac{x^{4} + 6 x^{3} - 54 x - 81 - 2 ((x^{2} - 6 x + 9) (x \cdot x + x \cdot 3 + 3 (x + 3))) + (x^{2} - 9) {(x - 3)}^{2}}{{(x + 3)}^{2} {(x - 3)}^{2} (x^{2} - 9)}$

Apply the distributive property.

$\frac{x^{4} + 6 x^{3} - 54 x - 81 - 2 ((x^{2} - 6 x + 9) (x \cdot x + x \cdot 3 + 3 x + 3 \cdot 3)) + (x^{2} - 9) {(x - 3)}^{2}}{{(x + 3)}^{2} {(x - 3)}^{2} (x^{2} - 9)}$

Simplify and combine like terms.

Simplify each term.

Multiply $x$ by $x$ .

$\frac{x^{4} + 6 x^{3} - 54 x - 81 - 2 ((x^{2} - 6 x + 9) (x^{2} + x \cdot 3 + 3 x + 3 \cdot 3)) + (x^{2} - 9) {(x - 3)}^{2}}{{(x + 3)}^{2} {(x - 3)}^{2} (x^{2} - 9)}$

Move $3$ to the left of $x$ .

$\frac{x^{4} + 6 x^{3} - 54 x - 81 - 2 ((x^{2} - 6 x + 9) (x^{2} + 3 \cdot x + 3 x + 3 \cdot 3)) + (x^{2} - 9) {(x - 3)}^{2}}{{(x + 3)}^{2} {(x - 3)}^{2} (x^{2} - 9)}$

Multiply $3$ by $3$ .

$\frac{x^{4} + 6 x^{3} - 54 x - 81 - 2 ((x^{2} - 6 x + 9) (x^{2} + 3 x + 3 x + 9)) + (x^{2} - 9) {(x - 3)}^{2}}{{(x + 3)}^{2} {(x - 3)}^{2} (x^{2} - 9)}$

Add $3 x$ and $3 x$ .

$\frac{x^{4} + 6 x^{3} - 54 x - 81 - 2 ((x^{2} - 6 x + 9) (x^{2} + 6 x + 9)) + (x^{2} - 9) {(x - 3)}^{2}}{{(x + 3)}^{2} {(x - 3)}^{2} (x^{2} - 9)}$

Expand $(x^{2} - 6 x + 9) (x^{2} + 6 x + 9)$ by multiplying each term in the first expression by each term in the second expression.

$\frac{x^{4} + 6 x^{3} - 54 x - 81 - 2 (x^{2} x^{2} + x^{2} (6 x) + x^{2} \cdot 9 - 6 x \cdot x^{2} - 6 x (6 x) - 6 x \cdot 9 + 9 x^{2} + 9 (6 x) + 9 \cdot 9) + (x^{2} - 9) {(x - 3)}^{2}}{{(x + 3)}^{2} {(x - 3)}^{2} (x^{2} - 9)}$

Combine the opposite terms in $x^{2} x^{2} + x^{2} (6 x) + x^{2} \cdot 9 - 6 x \cdot x^{2} - 6 x (6 x) - 6 x \cdot 9 + 9 x^{2} + 9 (6 x) + 9 \cdot 9$ .

Reorder the factors in the terms $x^{2} (6 x)$ and $- 6 x \cdot x^{2}$ .

$\frac{x^{4} + 6 x^{3} - 54 x - 81 - 2 (x^{2} x^{2} + 6 x^{2} x + x^{2} \cdot 9 - 6 x^{2} x - 6 x (6 x) - 6 x \cdot 9 + 9 x^{2} + 9 (6 x) + 9 \cdot 9) + (x^{2} - 9) {(x - 3)}^{2}}{{(x + 3)}^{2} {(x - 3)}^{2} (x^{2} - 9)}$

Subtract $6 x^{2} x$ from $6 x^{2} x$ .

$\frac{x^{4} + 6 x^{3} - 54 x - 81 - 2 (x^{2} x^{2} + x^{2} \cdot 9 + 0 - 6 x (6 x) - 6 x \cdot 9 + 9 x^{2} + 9 (6 x) + 9 \cdot 9) + (x^{2} - 9) {(x - 3)}^{2}}{{(x + 3)}^{2} {(x - 3)}^{2} (x^{2} - 9)}$

Add $x^{2} x^{2} + x^{2} \cdot 9$ and $0$ .

$\frac{x^{4} + 6 x^{3} - 54 x - 81 - 2 (x^{2} x^{2} + x^{2} \cdot 9 - 6 x (6 x) - 6 x \cdot 9 + 9 x^{2} + 9 (6 x) + 9 \cdot 9) + (x^{2} - 9) {(x - 3)}^{2}}{{(x + 3)}^{2} {(x - 3)}^{2} (x^{2} - 9)}$

Reorder the factors in the terms $- 6 x \cdot 9$ and $9 (6 x)$ .

$\frac{x^{4} + 6 x^{3} - 54 x - 81 - 2 (x^{2} x^{2} + x^{2} \cdot 9 - 6 x (6 x) - 6 \cdot 9 x + 9 x^{2} + 6 \cdot 9 x + 9 \cdot 9) + (x^{2} - 9) {(x - 3)}^{2}}{{(x + 3)}^{2} {(x - 3)}^{2} (x^{2} - 9)}$

Add $- 6 \cdot 9 x$ and $6 \cdot 9 x$ .

$\frac{x^{4} + 6 x^{3} - 54 x - 81 - 2 (x^{2} x^{2} + x^{2} \cdot 9 - 6 x (6 x) + 9 x^{2} + 0 + 9 \cdot 9) + (x^{2} - 9) {(x - 3)}^{2}}{{(x + 3)}^{2} {(x - 3)}^{2} (x^{2} - 9)}$

Add $x^{2} x^{2} + x^{2} \cdot 9 - 6 x (6 x) + 9 x^{2}$ and $0$ .

$\frac{x^{4} + 6 x^{3} - 54 x - 81 - 2 (x^{2} x^{2} + x^{2} \cdot 9 - 6 x (6 x) + 9 x^{2} + 9 \cdot 9) + (x^{2} - 9) {(x - 3)}^{2}}{{(x + 3)}^{2} {(x - 3)}^{2} (x^{2} - 9)}$

Simplify each term.

Multiply $x^{2}$ by $x^{2}$ by adding the exponents.

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$\frac{x^{4} + 6 x^{3} - 54 x - 81 - 2 (x^{2 + 2} + x^{2} \cdot 9 - 6 x (6 x) + 9 x^{2} + 9 \cdot 9) + (x^{2} - 9) {(x - 3)}^{2}}{{(x + 3)}^{2} {(x - 3)}^{2} (x^{2} - 9)}$

Add $2$ and $2$ .

$\frac{x^{4} + 6 x^{3} - 54 x - 81 - 2 (x^{4} + x^{2} \cdot 9 - 6 x (6 x) + 9 x^{2} + 9 \cdot 9) + (x^{2} - 9) {(x - 3)}^{2}}{{(x + 3)}^{2} {(x - 3)}^{2} (x^{2} - 9)}$

Move $9$ to the left of $x^{2}$ .

$\frac{x^{4} + 6 x^{3} - 54 x - 81 - 2 (x^{4} + 9 \cdot x^{2} - 6 x (6 x) + 9 x^{2} + 9 \cdot 9) + (x^{2} - 9) {(x - 3)}^{2}}{{(x + 3)}^{2} {(x - 3)}^{2} (x^{2} - 9)}$

Rewrite using the commutative property of multiplication.

$\frac{x^{4} + 6 x^{3} - 54 x - 81 - 2 (x^{4} + 9 x^{2} - 6 \cdot 6 x \cdot x + 9 x^{2} + 9 \cdot 9) + (x^{2} - 9) {(x - 3)}^{2}}{{(x + 3)}^{2} {(x - 3)}^{2} (x^{2} - 9)}$

Multiply $x$ by $x$ by adding the exponents.

Move $x$ .

$\frac{x^{4} + 6 x^{3} - 54 x - 81 - 2 (x^{4} + 9 x^{2} - 6 \cdot 6 (x \cdot x) + 9 x^{2} + 9 \cdot 9) + (x^{2} - 9) {(x - 3)}^{2}}{{(x + 3)}^{2} {(x - 3)}^{2} (x^{2} - 9)}$

Multiply $x$ by $x$ .

$\frac{x^{4} + 6 x^{3} - 54 x - 81 - 2 (x^{4} + 9 x^{2} - 6 \cdot 6 x^{2} + 9 x^{2} + 9 \cdot 9) + (x^{2} - 9) {(x - 3)}^{2}}{{(x + 3)}^{2} {(x - 3)}^{2} (x^{2} - 9)}$

Multiply $- 6$ by $6$ .

$\frac{x^{4} + 6 x^{3} - 54 x - 81 - 2 (x^{4} + 9 x^{2} - 36 x^{2} + 9 x^{2} + 9 \cdot 9) + (x^{2} - 9) {(x - 3)}^{2}}{{(x + 3)}^{2} {(x - 3)}^{2} (x^{2} - 9)}$

Multiply $9$ by $9$ .

$\frac{x^{4} + 6 x^{3} - 54 x - 81 - 2 (x^{4} + 9 x^{2} - 36 x^{2} + 9 x^{2} + 81) + (x^{2} - 9) {(x - 3)}^{2}}{{(x + 3)}^{2} {(x - 3)}^{2} (x^{2} - 9)}$

Subtract $36 x^{2}$ from $9 x^{2}$ .

$\frac{x^{4} + 6 x^{3} - 54 x - 81 - 2 (x^{4} - 27 x^{2} + 9 x^{2} + 81) + (x^{2} - 9) {(x - 3)}^{2}}{{(x + 3)}^{2} {(x - 3)}^{2} (x^{2} - 9)}$

Add $- 27 x^{2}$ and $9 x^{2}$ .

$\frac{x^{4} + 6 x^{3} - 54 x - 81 - 2 (x^{4} - 18 x^{2} + 81) + (x^{2} - 9) {(x - 3)}^{2}}{{(x + 3)}^{2} {(x - 3)}^{2} (x^{2} - 9)}$

Apply the distributive property.

$\frac{x^{4} + 6 x^{3} - 54 x - 81 - 2 x^{4} - 2 (- 18 x^{2}) - 2 \cdot 81 + (x^{2} - 9) {(x - 3)}^{2}}{{(x + 3)}^{2} {(x - 3)}^{2} (x^{2} - 9)}$

Simplify.

Multiply $- 18$ by $- 2$ .

$\frac{x^{4} + 6 x^{3} - 54 x - 81 - 2 x^{4} + 36 x^{2} - 2 \cdot 81 + (x^{2} - 9) {(x - 3)}^{2}}{{(x + 3)}^{2} {(x - 3)}^{2} (x^{2} - 9)}$

Multiply $- 2$ by $81$ .

$\frac{x^{4} + 6 x^{3} - 54 x - 81 - 2 x^{4} + 36 x^{2} - 162 + (x^{2} - 9) {(x - 3)}^{2}}{{(x + 3)}^{2} {(x - 3)}^{2} (x^{2} - 9)}$

Rewrite ${(x - 3)}^{2}$ as $(x - 3) (x - 3)$ .

$\frac{x^{4} + 6 x^{3} - 54 x - 81 - 2 x^{4} + 36 x^{2} - 162 + (x^{2} - 9) ((x - 3) (x - 3))}{{(x + 3)}^{2} {(x - 3)}^{2} (x^{2} - 9)}$

Expand $(x - 3) (x - 3)$ using the FOIL Method.

Apply the distributive property.

$\frac{x^{4} + 6 x^{3} - 54 x - 81 - 2 x^{4} + 36 x^{2} - 162 + (x^{2} - 9) (x (x - 3) - 3 (x - 3))}{{(x + 3)}^{2} {(x - 3)}^{2} (x^{2} - 9)}$

Apply the distributive property.

$\frac{x^{4} + 6 x^{3} - 54 x - 81 - 2 x^{4} + 36 x^{2} - 162 + (x^{2} - 9) (x \cdot x + x \cdot - 3 - 3 (x - 3))}{{(x + 3)}^{2} {(x - 3)}^{2} (x^{2} - 9)}$

Apply the distributive property.

$\frac{x^{4} + 6 x^{3} - 54 x - 81 - 2 x^{4} + 36 x^{2} - 162 + (x^{2} - 9) (x \cdot x + x \cdot - 3 - 3 x - 3 \cdot - 3)}{{(x + 3)}^{2} {(x - 3)}^{2} (x^{2} - 9)}$

Simplify and combine like terms.

Simplify each term.

Multiply $x$ by $x$ .

$\frac{x^{4} + 6 x^{3} - 54 x - 81 - 2 x^{4} + 36 x^{2} - 162 + (x^{2} - 9) (x^{2} + x \cdot - 3 - 3 x - 3 \cdot - 3)}{{(x + 3)}^{2} {(x - 3)}^{2} (x^{2} - 9)}$

Move $- 3$ to the left of $x$ .

$\frac{x^{4} + 6 x^{3} - 54 x - 81 - 2 x^{4} + 36 x^{2} - 162 + (x^{2} - 9) (x^{2} - 3 \cdot x - 3 x - 3 \cdot - 3)}{{(x + 3)}^{2} {(x - 3)}^{2} (x^{2} - 9)}$

Multiply $- 3$ by $- 3$ .

$\frac{x^{4} + 6 x^{3} - 54 x - 81 - 2 x^{4} + 36 x^{2} - 162 + (x^{2} - 9) (x^{2} - 3 x - 3 x + 9)}{{(x + 3)}^{2} {(x - 3)}^{2} (x^{2} - 9)}$

Subtract $3 x$ from $- 3 x$ .

$\frac{x^{4} + 6 x^{3} - 54 x - 81 - 2 x^{4} + 36 x^{2} - 162 + (x^{2} - 9) (x^{2} - 6 x + 9)}{{(x + 3)}^{2} {(x - 3)}^{2} (x^{2} - 9)}$

Expand $(x^{2} - 9) (x^{2} - 6 x + 9)$ by multiplying each term in the first expression by each term in the second expression.

$\frac{x^{4} + 6 x^{3} - 54 x - 81 - 2 x^{4} + 36 x^{2} - 162 + x^{2} x^{2} + x^{2} (- 6 x) + x^{2} \cdot 9 - 9 x^{2} - 9 (- 6 x) - 9 \cdot 9}{{(x + 3)}^{2} {(x - 3)}^{2} (x^{2} - 9)}$

Combine the opposite terms in $x^{2} x^{2} + x^{2} (- 6 x) + x^{2} \cdot 9 - 9 x^{2} - 9 (- 6 x) - 9 \cdot 9$ .

Reorder the factors in the terms $x^{2} \cdot 9$ and $- 9 x^{2}$ .

$\frac{x^{4} + 6 x^{3} - 54 x - 81 - 2 x^{4} + 36 x^{2} - 162 + x^{2} x^{2} + x^{2} (- 6 x) + 9 x^{2} - 9 x^{2} - 9 (- 6 x) - 9 \cdot 9}{{(x + 3)}^{2} {(x - 3)}^{2} (x^{2} - 9)}$

Subtract $9 x^{2}$ from $9 x^{2}$ .

$\frac{x^{4} + 6 x^{3} - 54 x - 81 - 2 x^{4} + 36 x^{2} - 162 + x^{2} x^{2} + x^{2} (- 6 x) + 0 - 9 (- 6 x) - 9 \cdot 9}{{(x + 3)}^{2} {(x - 3)}^{2} (x^{2} - 9)}$

Add $x^{2} x^{2} + x^{2} (- 6 x)$ and $0$ .

$\frac{x^{4} + 6 x^{3} - 54 x - 81 - 2 x^{4} + 36 x^{2} - 162 + x^{2} x^{2} + x^{2} (- 6 x) - 9 (- 6 x) - 9 \cdot 9}{{(x + 3)}^{2} {(x - 3)}^{2} (x^{2} - 9)}$

Simplify each term.

Multiply $x^{2}$ by $x^{2}$ by adding the exponents.

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$\frac{x^{4} + 6 x^{3} - 54 x - 81 - 2 x^{4} + 36 x^{2} - 162 + x^{2 + 2} + x^{2} (- 6 x) - 9 (- 6 x) - 9 \cdot 9}{{(x + 3)}^{2} {(x - 3)}^{2} (x^{2} - 9)}$

Add $2$ and $2$ .

$\frac{x^{4} + 6 x^{3} - 54 x - 81 - 2 x^{4} + 36 x^{2} - 162 + x^{4} + x^{2} (- 6 x) - 9 (- 6 x) - 9 \cdot 9}{{(x + 3)}^{2} {(x - 3)}^{2} (x^{2} - 9)}$

Rewrite using the commutative property of multiplication.

$\frac{x^{4} + 6 x^{3} - 54 x - 81 - 2 x^{4} + 36 x^{2} - 162 + x^{4} - 6 x^{2} x - 9 (- 6 x) - 9 \cdot 9}{{(x + 3)}^{2} {(x - 3)}^{2} (x^{2} - 9)}$

Multiply $x^{2}$ by $x$ by adding the exponents.

Move $x$ .

$\frac{x^{4} + 6 x^{3} - 54 x - 81 - 2 x^{4} + 36 x^{2} - 162 + x^{4} - 6 (x \cdot x^{2}) - 9 (- 6 x) - 9 \cdot 9}{{(x + 3)}^{2} {(x - 3)}^{2} (x^{2} - 9)}$

Multiply $x$ by $x^{2}$ .

Raise $x$ to the power of $1$ .

$\frac{x^{4} + 6 x^{3} - 54 x - 81 - 2 x^{4} + 36 x^{2} - 162 + x^{4} - 6 (x^{1} x^{2}) - 9 (- 6 x) - 9 \cdot 9}{{(x + 3)}^{2} {(x - 3)}^{2} (x^{2} - 9)}$

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$\frac{x^{4} + 6 x^{3} - 54 x - 81 - 2 x^{4} + 36 x^{2} - 162 + x^{4} - 6 x^{1 + 2} - 9 (- 6 x) - 9 \cdot 9}{{(x + 3)}^{2} {(x - 3)}^{2} (x^{2} - 9)}$

Add $1$ and $2$ .

$\frac{x^{4} + 6 x^{3} - 54 x - 81 - 2 x^{4} + 36 x^{2} - 162 + x^{4} - 6 x^{3} - 9 (- 6 x) - 9 \cdot 9}{{(x + 3)}^{2} {(x - 3)}^{2} (x^{2} - 9)}$

Multiply $- 6$ by $- 9$ .

$\frac{x^{4} + 6 x^{3} - 54 x - 81 - 2 x^{4} + 36 x^{2} - 162 + x^{4} - 6 x^{3} + 54 x - 9 \cdot 9}{{(x + 3)}^{2} {(x - 3)}^{2} (x^{2} - 9)}$

Multiply $- 9$ by $9$ .

$\frac{x^{4} + 6 x^{3} - 54 x - 81 - 2 x^{4} + 36 x^{2} - 162 + x^{4} - 6 x^{3} + 54 x - 81}{{(x + 3)}^{2} {(x - 3)}^{2} (x^{2} - 9)}$

Simplify by adding terms.

Combine the opposite terms in $x^{4} + 6 x^{3} - 54 x - 81 - 2 x^{4} + 36 x^{2} - 162 + x^{4} - 6 x^{3} + 54 x - 81$ .

Subtract $6 x^{3}$ from $6 x^{3}$ .

$\frac{x^{4} - 54 x - 81 - 2 x^{4} + 36 x^{2} - 162 + x^{4} + 0 + 54 x - 81}{{(x + 3)}^{2} {(x - 3)}^{2} (x^{2} - 9)}$

Add $x^{4} - 54 x - 81 - 2 x^{4} + 36 x^{2} - 162 + x^{4}$ and $0$ .

$\frac{x^{4} - 54 x - 81 - 2 x^{4} + 36 x^{2} - 162 + x^{4} + 54 x - 81}{{(x + 3)}^{2} {(x - 3)}^{2} (x^{2} - 9)}$

Add $- 54 x$ and $54 x$ .

$\frac{x^{4} - 81 - 2 x^{4} + 36 x^{2} - 162 + x^{4} + 0 - 81}{{(x + 3)}^{2} {(x - 3)}^{2} (x^{2} - 9)}$

Add $x^{4} - 81 - 2 x^{4} + 36 x^{2} - 162 + x^{4}$ and $0$ .

$\frac{x^{4} - 81 - 2 x^{4} + 36 x^{2} - 162 + x^{4} - 81}{{(x + 3)}^{2} {(x - 3)}^{2} (x^{2} - 9)}$

Subtract $2 x^{4}$ from $x^{4}$ .

$\frac{- x^{4} - 81 + 36 x^{2} - 162 + x^{4} - 81}{{(x + 3)}^{2} {(x - 3)}^{2} (x^{2} - 9)}$

Combine the opposite terms in $- x^{4} - 81 + 36 x^{2} - 162 + x^{4} - 81$ .

Add $- x^{4}$ and $x^{4}$ .

$\frac{- 81 + 36 x^{2} - 162 + 0 - 81}{{(x + 3)}^{2} {(x - 3)}^{2} (x^{2} - 9)}$

Add $- 81 + 36 x^{2} - 162$ and $0$ .

$\frac{- 81 + 36 x^{2} - 162 - 81}{{(x + 3)}^{2} {(x - 3)}^{2} (x^{2} - 9)}$

Simplify by subtracting numbers.

Subtract $162$ from $- 81$ .

$\frac{36 x^{2} - 243 - 81}{{(x + 3)}^{2} {(x - 3)}^{2} (x^{2} - 9)}$

Subtract $81$ from $- 243$ .

$\frac{36 x^{2} - 324}{{(x + 3)}^{2} {(x - 3)}^{2} (x^{2} - 9)}$

Simplify the numerator.

Factor $36$ out of $36 x^{2} - 324$ .

Factor $36$ out of $36 x^{2}$ .

$\frac{36 (x^{2}) - 324}{{(x + 3)}^{2} {(x - 3)}^{2} (x^{2} - 9)}$

Factor $36$ out of $- 324$ .

$\frac{36 x^{2} + 36 \cdot - 9}{{(x + 3)}^{2} {(x - 3)}^{2} (x^{2} - 9)}$

Factor $36$ out of $36 x^{2} + 36 \cdot - 9$ .

$\frac{36 (x^{2} - 9)}{{(x + 3)}^{2} {(x - 3)}^{2} (x^{2} - 9)}$

Rewrite $9$ as $3^{2}$ .

$\frac{36 (x^{2} - 3^{2})}{{(x + 3)}^{2} {(x - 3)}^{2} (x^{2} - 9)}$

Since both terms are perfect squares, factor using the difference of squares formula, $a^{2} - b^{2} = (a + b) (a - b)$ where $a = x$ and $b = 3$ .

$\frac{36 (x + 3) (x - 3)}{{(x + 3)}^{2} {(x - 3)}^{2} (x^{2} - 9)}$

Simplify the denominator.

Rewrite $9$ as $3^{2}$ .

$\frac{36 (x + 3) (x - 3)}{{(x + 3)}^{2} {(x - 3)}^{2} (x^{2} - 3^{2})}$

Since both terms are perfect squares, factor using the difference of squares formula, $a^{2} - b^{2} = (a + b) (a - b)$ where $a = x$ and $b = 3$ .

$\frac{36 (x + 3) (x - 3)}{{(x + 3)}^{2} {(x - 3)}^{2} (x + 3) (x - 3)}$

Combine exponents.

Raise $x + 3$ to the power of $1$ .

$\frac{36 (x + 3) (x - 3)}{{(x + 3)}^{1} {(x + 3)}^{2} {(x - 3)}^{2} (x - 3)}$

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$\frac{36 (x + 3) (x - 3)}{{(x + 3)}^{1 + 2} {(x - 3)}^{2} (x - 3)}$

Add $1$ and $2$ .

$\frac{36 (x + 3) (x - 3)}{{(x + 3)}^{3} {(x - 3)}^{2} (x - 3)}$

Raise $x - 3$ to the power of $1$ .

$\frac{36 (x + 3) (x - 3)}{{(x + 3)}^{3} ({(x - 3)}^{1} {(x - 3)}^{2})}$

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$\frac{36 (x + 3) (x - 3)}{{(x + 3)}^{3} {(x - 3)}^{1 + 2}}$

Add $1$ and $2$ .

$\frac{36 (x + 3) (x - 3)}{{(x + 3)}^{3} {(x - 3)}^{3}}$

Reduce the expression by cancelling the common factors.

Cancel the common factor of $x + 3$ and ${(x + 3)}^{3}$ .

Factor $x + 3$ out of $36 (x + 3) (x - 3)$ .

$\frac{(x + 3) (36 (x - 3))}{{(x + 3)}^{3} {(x - 3)}^{3}}$

Cancel the common factors.

Factor $x + 3$ out of ${(x + 3)}^{3} {(x - 3)}^{3}$ .

$\frac{(x + 3) (36 (x - 3))}{(x + 3) ({(x + 3)}^{2} {(x - 3)}^{3})}$

Cancel the common factor.

$\frac{(x + 3) (36 (x - 3))}{(x + 3) ({(x + 3)}^{2} {(x - 3)}^{3})}$

Rewrite the expression.

$\frac{36 (x - 3)}{{(x + 3)}^{2} {(x - 3)}^{3}}$

Cancel the common factor of $x - 3$ and ${(x - 3)}^{3}$ .

Factor $x - 3$ out of $36 (x - 3)$ .

$\frac{(x - 3) \cdot 36}{{(x + 3)}^{2} {(x - 3)}^{3}}$

Cancel the common factors.

Factor $x - 3$ out of ${(x + 3)}^{2} {(x - 3)}^{3}$ .

$\frac{(x - 3) \cdot 36}{(x - 3) ({(x + 3)}^{2} {(x - 3)}^{2})}$

Cancel the common factor.

$\frac{(x - 3) \cdot 36}{(x - 3) ({(x + 3)}^{2} {(x - 3)}^{2})}$

Rewrite the expression.

$\frac{36}{{(x + 3)}^{2} {(x - 3)}^{2}}$

Simplify 1/((x-3)^2)-2/(x^2-9)+1/((x+3)^2)

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