Write in Standard Form f(x)=(x-1)^2(x+1)

$f (x) = {(x - 1)}^{2} (x + 1)$

Step 1

To write a polynomial in standard form, simplify and then arrange the terms in descending order.

$f (x) = a x^{2} + b x + c$

Step 2

Rewrite ${(x - 1)}^{2}$ as $(x - 1) (x - 1)$ .

$f (x) = (x - 1) (x - 1) (x + 1)$

Step 3

Expand $(x - 1) (x - 1)$ using the FOIL Method.

Apply the distributive property.

$f (x) = (x (x - 1) - 1 (x - 1)) (x + 1)$

Apply the distributive property.

$f (x) = (x \cdot x + x \cdot - 1 - 1 (x - 1)) (x + 1)$

Apply the distributive property.

$f (x) = (x \cdot x + x \cdot - 1 - 1 x - 1 \cdot - 1) (x + 1)$

Step 4

Simplify and combine like terms.

Simplify each term.

Multiply $x$ by $x$ .

$f (x) = (x^{2} + x \cdot - 1 - 1 x - 1 \cdot - 1) (x + 1)$

Move $- 1$ to the left of $x$ .

$f (x) = (x^{2} - 1 \cdot x - 1 x - 1 \cdot - 1) (x + 1)$

Rewrite $- 1 x$ as $- x$ .

$f (x) = (x^{2} - x - 1 x - 1 \cdot - 1) (x + 1)$

Rewrite $- 1 x$ as $- x$ .

$f (x) = (x^{2} - x - x - 1 \cdot - 1) (x + 1)$

Multiply $- 1$ by $- 1$ .

$f (x) = (x^{2} - x - x + 1) (x + 1)$

Subtract $x$ from $- x$ .

$f (x) = (x^{2} - 2 x + 1) (x + 1)$

Step 5

Expand $(x^{2} - 2 x + 1) (x + 1)$ by multiplying each term in the first expression by each term in the second expression.

$f (x) = x^{2} x + x^{2} \cdot 1 - 2 x \cdot x - 2 x \cdot 1 + 1 x + 1 \cdot 1$

Step 6

Simplify terms.

Simplify each term.

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

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

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

$f (x) = x^{2} x + x^{2} \cdot 1 - 2 x \cdot x - 2 x \cdot 1 + 1 x + 1 \cdot 1$

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

$f (x) = x^{2 + 1} + x^{2} \cdot 1 - 2 x \cdot x - 2 x \cdot 1 + 1 x + 1 \cdot 1$

Add $2$ and $1$ .

$f (x) = x^{3} + x^{2} \cdot 1 - 2 x \cdot x - 2 x \cdot 1 + 1 x + 1 \cdot 1$

Multiply $x^{2}$ by $1$ .

$f (x) = x^{3} + x^{2} - 2 x \cdot x - 2 x \cdot 1 + 1 x + 1 \cdot 1$

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

Move $x$ .

$f (x) = x^{3} + x^{2} - 2 (x \cdot x) - 2 x \cdot 1 + 1 x + 1 \cdot 1$

Multiply $x$ by $x$ .

$f (x) = x^{3} + x^{2} - 2 x^{2} - 2 x \cdot 1 + 1 x + 1 \cdot 1$

Multiply $- 2$ by $1$ .

$f (x) = x^{3} + x^{2} - 2 x^{2} - 2 x + 1 x + 1 \cdot 1$

Multiply $x$ by $1$ .

$f (x) = x^{3} + x^{2} - 2 x^{2} - 2 x + x + 1 \cdot 1$

Multiply $1$ by $1$ .

$f (x) = x^{3} + x^{2} - 2 x^{2} - 2 x + x + 1$

Simplify by adding terms.

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

$f (x) = x^{3} - x^{2} - 2 x + x + 1$

Add $- 2 x$ and $x$ .

$f (x) = x^{3} - x^{2} - x + 1$

Write in Standard Form f(x)=(x-1)^2(x+1)

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