Evaluate fourth root of 256(x^2-1)^12

$\sqrt[4]{256 {(x^{2} - 1)}^{12}}$

Rewrite $1$ as $1^{2}$ .

$\sqrt[4]{256 {(x^{2} - 1^{2})}^{12}}$

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 $b = 1$ .

$\sqrt[4]{256 {((x + 1) (x - 1))}^{12}}$

Apply the product rule to $(x + 1) (x - 1)$ .

$\sqrt[4]{256 {(x + 1)}^{12} {(x - 1)}^{12}}$

Rewrite $256 {(x + 1)}^{12} {(x - 1)}^{12}$ as ${(4 {(x + 1)}^{3} {(x - 1)}^{3})}^{4}$ .

$\sqrt[4]{{(4 {(x + 1)}^{3} {(x - 1)}^{3})}^{4}}$

Pull terms out from under the radical, assuming positive real numbers.

$4 {(x + 1)}^{3} {(x - 1)}^{3}$

Use the Binomial Theorem.

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

Simplify terms.

Simplify each term.

Multiply $3$ by $1$ .

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

One to any power is one.

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

Multiply $3$ by $1$ .

$4 (x^{3} + 3 x^{2} + 3 x + 1^{3}) {(x - 1)}^{3}$

One to any power is one.

$4 (x^{3} + 3 x^{2} + 3 x + 1) {(x - 1)}^{3}$

Apply the distributive property.

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

Simplify.

Multiply $3$ by $4$ .

$(4 x^{3} + 12 x^{2} + 4 (3 x) + 4 \cdot 1) {(x - 1)}^{3}$

Multiply $3$ by $4$ .

$(4 x^{3} + 12 x^{2} + 12 x + 4 \cdot 1) {(x - 1)}^{3}$

Multiply $4$ by $1$ .

$(4 x^{3} + 12 x^{2} + 12 x + 4) {(x - 1)}^{3}$

Use the Binomial Theorem.

$(4 x^{3} + 12 x^{2} + 12 x + 4) (x^{3} + 3 x^{2} \cdot - 1 + 3 x {(- 1)}^{2} + {(- 1)}^{3})$

Simplify each term.

Multiply $- 1$ by $3$ .

$(4 x^{3} + 12 x^{2} + 12 x + 4) (x^{3} - 3 x^{2} + 3 x {(- 1)}^{2} + {(- 1)}^{3})$

Raise $- 1$ to the power of $2$ .

$(4 x^{3} + 12 x^{2} + 12 x + 4) (x^{3} - 3 x^{2} + 3 x \cdot 1 + {(- 1)}^{3})$

Multiply $3$ by $1$ .

$(4 x^{3} + 12 x^{2} + 12 x + 4) (x^{3} - 3 x^{2} + 3 x + {(- 1)}^{3})$

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

$(4 x^{3} + 12 x^{2} + 12 x + 4) (x^{3} - 3 x^{2} + 3 x - 1)$

Expand $(4 x^{3} + 12 x^{2} + 12 x + 4) (x^{3} - 3 x^{2} + 3 x - 1)$ by multiplying each term in the first expression by each term in the second expression.

$4 x^{3} x^{3} + 4 x^{3} (- 3 x^{2}) + 4 x^{3} (3 x) + 4 x^{3} \cdot - 1 + 12 x^{2} x^{3} + 12 x^{2} (- 3 x^{2}) + 12 x^{2} (3 x) + 12 x^{2} \cdot - 1 + 12 x \cdot x^{3} + 12 x (- 3 x^{2}) + 12 x (3 x) + 12 x \cdot - 1 + 4 x^{3} + 4 (- 3 x^{2}) + 4 (3 x) + 4 \cdot - 1$

Simplify terms.

Combine the opposite terms in $4 x^{3} x^{3} + 4 x^{3} (- 3 x^{2}) + 4 x^{3} (3 x) + 4 x^{3} \cdot - 1 + 12 x^{2} x^{3} + 12 x^{2} (- 3 x^{2}) + 12 x^{2} (3 x) + 12 x^{2} \cdot - 1 + 12 x \cdot x^{3} + 12 x (- 3 x^{2}) + 12 x (3 x) + 12 x \cdot - 1 + 4 x^{3} + 4 (- 3 x^{2}) + 4 (3 x) + 4 \cdot - 1$ .

Reorder the factors in the terms $12 x^{2} (3 x)$ and $12 x (- 3 x^{2})$ .

$4 x^{3} x^{3} + 4 x^{3} (- 3 x^{2}) + 4 x^{3} (3 x) + 4 x^{3} \cdot - 1 + 12 x^{2} x^{3} + 12 x^{2} (- 3 x^{2}) + 3 \cdot 12 x^{2} x + 12 x^{2} \cdot - 1 + 12 x \cdot x^{3} - 3 \cdot 12 x^{2} x + 12 x (3 x) + 12 x \cdot - 1 + 4 x^{3} + 4 (- 3 x^{2}) + 4 (3 x) + 4 \cdot - 1$

Subtract $3 \cdot 12 x^{2} x$ from $3 \cdot 12 x^{2} x$ .

$4 x^{3} x^{3} + 4 x^{3} (- 3 x^{2}) + 4 x^{3} (3 x) + 4 x^{3} \cdot - 1 + 12 x^{2} x^{3} + 12 x^{2} (- 3 x^{2}) + 12 x^{2} \cdot - 1 + 12 x \cdot x^{3} + 0 + 12 x (3 x) + 12 x \cdot - 1 + 4 x^{3} + 4 (- 3 x^{2}) + 4 (3 x) + 4 \cdot - 1$

Add $4 x^{3} x^{3} + 4 x^{3} (- 3 x^{2}) + 4 x^{3} (3 x) + 4 x^{3} \cdot - 1 + 12 x^{2} x^{3} + 12 x^{2} (- 3 x^{2}) + 12 x^{2} \cdot - 1 + 12 x \cdot x^{3}$ and $0$ .

$4 x^{3} x^{3} + 4 x^{3} (- 3 x^{2}) + 4 x^{3} (3 x) + 4 x^{3} \cdot - 1 + 12 x^{2} x^{3} + 12 x^{2} (- 3 x^{2}) + 12 x^{2} \cdot - 1 + 12 x \cdot x^{3} + 12 x (3 x) + 12 x \cdot - 1 + 4 x^{3} + 4 (- 3 x^{2}) + 4 (3 x) + 4 \cdot - 1$

Simplify each term.

Multiply $x^{3}$ by $x^{3}$ by adding the exponents.

Move $x^{3}$ .

$4 (x^{3} x^{3}) + 4 x^{3} (- 3 x^{2}) + 4 x^{3} (3 x) + 4 x^{3} \cdot - 1 + 12 x^{2} x^{3} + 12 x^{2} (- 3 x^{2}) + 12 x^{2} \cdot - 1 + 12 x \cdot x^{3} + 12 x (3 x) + 12 x \cdot - 1 + 4 x^{3} + 4 (- 3 x^{2}) + 4 (3 x) + 4 \cdot - 1$

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

$4 x^{3 + 3} + 4 x^{3} (- 3 x^{2}) + 4 x^{3} (3 x) + 4 x^{3} \cdot - 1 + 12 x^{2} x^{3} + 12 x^{2} (- 3 x^{2}) + 12 x^{2} \cdot - 1 + 12 x \cdot x^{3} + 12 x (3 x) + 12 x \cdot - 1 + 4 x^{3} + 4 (- 3 x^{2}) + 4 (3 x) + 4 \cdot - 1$

Add $3$ and $3$ .

$4 x^{6} + 4 x^{3} (- 3 x^{2}) + 4 x^{3} (3 x) + 4 x^{3} \cdot - 1 + 12 x^{2} x^{3} + 12 x^{2} (- 3 x^{2}) + 12 x^{2} \cdot - 1 + 12 x \cdot x^{3} + 12 x (3 x) + 12 x \cdot - 1 + 4 x^{3} + 4 (- 3 x^{2}) + 4 (3 x) + 4 \cdot - 1$

Rewrite using the commutative property of multiplication.

$4 x^{6} + 4 \cdot - 3 x^{3} x^{2} + 4 x^{3} (3 x) + 4 x^{3} \cdot - 1 + 12 x^{2} x^{3} + 12 x^{2} (- 3 x^{2}) + 12 x^{2} \cdot - 1 + 12 x \cdot x^{3} + 12 x (3 x) + 12 x \cdot - 1 + 4 x^{3} + 4 (- 3 x^{2}) + 4 (3 x) + 4 \cdot - 1$

Multiply $x^{3}$ by $x^{2}$ by adding the exponents.

Move $x^{2}$ .

$4 x^{6} + 4 \cdot - 3 (x^{2} x^{3}) + 4 x^{3} (3 x) + 4 x^{3} \cdot - 1 + 12 x^{2} x^{3} + 12 x^{2} (- 3 x^{2}) + 12 x^{2} \cdot - 1 + 12 x \cdot x^{3} + 12 x (3 x) + 12 x \cdot - 1 + 4 x^{3} + 4 (- 3 x^{2}) + 4 (3 x) + 4 \cdot - 1$

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

$4 x^{6} + 4 \cdot - 3 x^{2 + 3} + 4 x^{3} (3 x) + 4 x^{3} \cdot - 1 + 12 x^{2} x^{3} + 12 x^{2} (- 3 x^{2}) + 12 x^{2} \cdot - 1 + 12 x \cdot x^{3} + 12 x (3 x) + 12 x \cdot - 1 + 4 x^{3} + 4 (- 3 x^{2}) + 4 (3 x) + 4 \cdot - 1$

Add $2$ and $3$ .

$4 x^{6} + 4 \cdot - 3 x^{5} + 4 x^{3} (3 x) + 4 x^{3} \cdot - 1 + 12 x^{2} x^{3} + 12 x^{2} (- 3 x^{2}) + 12 x^{2} \cdot - 1 + 12 x \cdot x^{3} + 12 x (3 x) + 12 x \cdot - 1 + 4 x^{3} + 4 (- 3 x^{2}) + 4 (3 x) + 4 \cdot - 1$

Multiply $4$ by $- 3$ .

$4 x^{6} - 12 x^{5} + 4 x^{3} (3 x) + 4 x^{3} \cdot - 1 + 12 x^{2} x^{3} + 12 x^{2} (- 3 x^{2}) + 12 x^{2} \cdot - 1 + 12 x \cdot x^{3} + 12 x (3 x) + 12 x \cdot - 1 + 4 x^{3} + 4 (- 3 x^{2}) + 4 (3 x) + 4 \cdot - 1$

Rewrite using the commutative property of multiplication.

$4 x^{6} - 12 x^{5} + 4 \cdot 3 x^{3} x + 4 x^{3} \cdot - 1 + 12 x^{2} x^{3} + 12 x^{2} (- 3 x^{2}) + 12 x^{2} \cdot - 1 + 12 x \cdot x^{3} + 12 x (3 x) + 12 x \cdot - 1 + 4 x^{3} + 4 (- 3 x^{2}) + 4 (3 x) + 4 \cdot - 1$

Multiply $x^{3}$ by $x$ by adding the exponents.

Move $x$ .

$4 x^{6} - 12 x^{5} + 4 \cdot 3 (x \cdot x^{3}) + 4 x^{3} \cdot - 1 + 12 x^{2} x^{3} + 12 x^{2} (- 3 x^{2}) + 12 x^{2} \cdot - 1 + 12 x \cdot x^{3} + 12 x (3 x) + 12 x \cdot - 1 + 4 x^{3} + 4 (- 3 x^{2}) + 4 (3 x) + 4 \cdot - 1$

Multiply $x$ by $x^{3}$ .

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

$4 x^{6} - 12 x^{5} + 4 \cdot 3 (x^{1} x^{3}) + 4 x^{3} \cdot - 1 + 12 x^{2} x^{3} + 12 x^{2} (- 3 x^{2}) + 12 x^{2} \cdot - 1 + 12 x \cdot x^{3} + 12 x (3 x) + 12 x \cdot - 1 + 4 x^{3} + 4 (- 3 x^{2}) + 4 (3 x) + 4 \cdot - 1$

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

$4 x^{6} - 12 x^{5} + 4 \cdot 3 x^{1 + 3} + 4 x^{3} \cdot - 1 + 12 x^{2} x^{3} + 12 x^{2} (- 3 x^{2}) + 12 x^{2} \cdot - 1 + 12 x \cdot x^{3} + 12 x (3 x) + 12 x \cdot - 1 + 4 x^{3} + 4 (- 3 x^{2}) + 4 (3 x) + 4 \cdot - 1$

Add $1$ and $3$ .

$4 x^{6} - 12 x^{5} + 4 \cdot 3 x^{4} + 4 x^{3} \cdot - 1 + 12 x^{2} x^{3} + 12 x^{2} (- 3 x^{2}) + 12 x^{2} \cdot - 1 + 12 x \cdot x^{3} + 12 x (3 x) + 12 x \cdot - 1 + 4 x^{3} + 4 (- 3 x^{2}) + 4 (3 x) + 4 \cdot - 1$

Multiply $4$ by $3$ .

$4 x^{6} - 12 x^{5} + 12 x^{4} + 4 x^{3} \cdot - 1 + 12 x^{2} x^{3} + 12 x^{2} (- 3 x^{2}) + 12 x^{2} \cdot - 1 + 12 x \cdot x^{3} + 12 x (3 x) + 12 x \cdot - 1 + 4 x^{3} + 4 (- 3 x^{2}) + 4 (3 x) + 4 \cdot - 1$

Multiply $- 1$ by $4$ .

$4 x^{6} - 12 x^{5} + 12 x^{4} - 4 x^{3} + 12 x^{2} x^{3} + 12 x^{2} (- 3 x^{2}) + 12 x^{2} \cdot - 1 + 12 x \cdot x^{3} + 12 x (3 x) + 12 x \cdot - 1 + 4 x^{3} + 4 (- 3 x^{2}) + 4 (3 x) + 4 \cdot - 1$

Multiply $x^{2}$ by $x^{3}$ by adding the exponents.

Move $x^{3}$ .

$4 x^{6} - 12 x^{5} + 12 x^{4} - 4 x^{3} + 12 (x^{3} x^{2}) + 12 x^{2} (- 3 x^{2}) + 12 x^{2} \cdot - 1 + 12 x \cdot x^{3} + 12 x (3 x) + 12 x \cdot - 1 + 4 x^{3} + 4 (- 3 x^{2}) + 4 (3 x) + 4 \cdot - 1$

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

$4 x^{6} - 12 x^{5} + 12 x^{4} - 4 x^{3} + 12 x^{3 + 2} + 12 x^{2} (- 3 x^{2}) + 12 x^{2} \cdot - 1 + 12 x \cdot x^{3} + 12 x (3 x) + 12 x \cdot - 1 + 4 x^{3} + 4 (- 3 x^{2}) + 4 (3 x) + 4 \cdot - 1$

Add $3$ and $2$ .

$4 x^{6} - 12 x^{5} + 12 x^{4} - 4 x^{3} + 12 x^{5} + 12 x^{2} (- 3 x^{2}) + 12 x^{2} \cdot - 1 + 12 x \cdot x^{3} + 12 x (3 x) + 12 x \cdot - 1 + 4 x^{3} + 4 (- 3 x^{2}) + 4 (3 x) + 4 \cdot - 1$

Rewrite using the commutative property of multiplication.

$4 x^{6} - 12 x^{5} + 12 x^{4} - 4 x^{3} + 12 x^{5} + 12 \cdot - 3 x^{2} x^{2} + 12 x^{2} \cdot - 1 + 12 x \cdot x^{3} + 12 x (3 x) + 12 x \cdot - 1 + 4 x^{3} + 4 (- 3 x^{2}) + 4 (3 x) + 4 \cdot - 1$

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

Move $x^{2}$ .

$4 x^{6} - 12 x^{5} + 12 x^{4} - 4 x^{3} + 12 x^{5} + 12 \cdot - 3 (x^{2} x^{2}) + 12 x^{2} \cdot - 1 + 12 x \cdot x^{3} + 12 x (3 x) + 12 x \cdot - 1 + 4 x^{3} + 4 (- 3 x^{2}) + 4 (3 x) + 4 \cdot - 1$

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

$4 x^{6} - 12 x^{5} + 12 x^{4} - 4 x^{3} + 12 x^{5} + 12 \cdot - 3 x^{2 + 2} + 12 x^{2} \cdot - 1 + 12 x \cdot x^{3} + 12 x (3 x) + 12 x \cdot - 1 + 4 x^{3} + 4 (- 3 x^{2}) + 4 (3 x) + 4 \cdot - 1$

Add $2$ and $2$ .

$4 x^{6} - 12 x^{5} + 12 x^{4} - 4 x^{3} + 12 x^{5} + 12 \cdot - 3 x^{4} + 12 x^{2} \cdot - 1 + 12 x \cdot x^{3} + 12 x (3 x) + 12 x \cdot - 1 + 4 x^{3} + 4 (- 3 x^{2}) + 4 (3 x) + 4 \cdot - 1$

Multiply $12$ by $- 3$ .

$4 x^{6} - 12 x^{5} + 12 x^{4} - 4 x^{3} + 12 x^{5} - 36 x^{4} + 12 x^{2} \cdot - 1 + 12 x \cdot x^{3} + 12 x (3 x) + 12 x \cdot - 1 + 4 x^{3} + 4 (- 3 x^{2}) + 4 (3 x) + 4 \cdot - 1$

Multiply $- 1$ by $12$ .

$4 x^{6} - 12 x^{5} + 12 x^{4} - 4 x^{3} + 12 x^{5} - 36 x^{4} - 12 x^{2} + 12 x \cdot x^{3} + 12 x (3 x) + 12 x \cdot - 1 + 4 x^{3} + 4 (- 3 x^{2}) + 4 (3 x) + 4 \cdot - 1$

Multiply $x$ by $x^{3}$ by adding the exponents.

Move $x^{3}$ .

$4 x^{6} - 12 x^{5} + 12 x^{4} - 4 x^{3} + 12 x^{5} - 36 x^{4} - 12 x^{2} + 12 (x^{3} x) + 12 x (3 x) + 12 x \cdot - 1 + 4 x^{3} + 4 (- 3 x^{2}) + 4 (3 x) + 4 \cdot - 1$

Multiply $x^{3}$ by $x$ .

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

$4 x^{6} - 12 x^{5} + 12 x^{4} - 4 x^{3} + 12 x^{5} - 36 x^{4} - 12 x^{2} + 12 (x^{3} x^{1}) + 12 x (3 x) + 12 x \cdot - 1 + 4 x^{3} + 4 (- 3 x^{2}) + 4 (3 x) + 4 \cdot - 1$

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

$4 x^{6} - 12 x^{5} + 12 x^{4} - 4 x^{3} + 12 x^{5} - 36 x^{4} - 12 x^{2} + 12 x^{3 + 1} + 12 x (3 x) + 12 x \cdot - 1 + 4 x^{3} + 4 (- 3 x^{2}) + 4 (3 x) + 4 \cdot - 1$

Add $3$ and $1$ .

$4 x^{6} - 12 x^{5} + 12 x^{4} - 4 x^{3} + 12 x^{5} - 36 x^{4} - 12 x^{2} + 12 x^{4} + 12 x (3 x) + 12 x \cdot - 1 + 4 x^{3} + 4 (- 3 x^{2}) + 4 (3 x) + 4 \cdot - 1$

Rewrite using the commutative property of multiplication.

$4 x^{6} - 12 x^{5} + 12 x^{4} - 4 x^{3} + 12 x^{5} - 36 x^{4} - 12 x^{2} + 12 x^{4} + 12 \cdot 3 x \cdot x + 12 x \cdot - 1 + 4 x^{3} + 4 (- 3 x^{2}) + 4 (3 x) + 4 \cdot - 1$

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

Move $x$ .

$4 x^{6} - 12 x^{5} + 12 x^{4} - 4 x^{3} + 12 x^{5} - 36 x^{4} - 12 x^{2} + 12 x^{4} + 12 \cdot 3 (x \cdot x) + 12 x \cdot - 1 + 4 x^{3} + 4 (- 3 x^{2}) + 4 (3 x) + 4 \cdot - 1$

Multiply $x$ by $x$ .

$4 x^{6} - 12 x^{5} + 12 x^{4} - 4 x^{3} + 12 x^{5} - 36 x^{4} - 12 x^{2} + 12 x^{4} + 12 \cdot 3 x^{2} + 12 x \cdot - 1 + 4 x^{3} + 4 (- 3 x^{2}) + 4 (3 x) + 4 \cdot - 1$

Multiply $12$ by $3$ .

$4 x^{6} - 12 x^{5} + 12 x^{4} - 4 x^{3} + 12 x^{5} - 36 x^{4} - 12 x^{2} + 12 x^{4} + 36 x^{2} + 12 x \cdot - 1 + 4 x^{3} + 4 (- 3 x^{2}) + 4 (3 x) + 4 \cdot - 1$

Multiply $- 1$ by $12$ .

$4 x^{6} - 12 x^{5} + 12 x^{4} - 4 x^{3} + 12 x^{5} - 36 x^{4} - 12 x^{2} + 12 x^{4} + 36 x^{2} - 12 x + 4 x^{3} + 4 (- 3 x^{2}) + 4 (3 x) + 4 \cdot - 1$

Multiply $- 3$ by $4$ .

$4 x^{6} - 12 x^{5} + 12 x^{4} - 4 x^{3} + 12 x^{5} - 36 x^{4} - 12 x^{2} + 12 x^{4} + 36 x^{2} - 12 x + 4 x^{3} - 12 x^{2} + 4 (3 x) + 4 \cdot - 1$

Multiply $3$ by $4$ .

$4 x^{6} - 12 x^{5} + 12 x^{4} - 4 x^{3} + 12 x^{5} - 36 x^{4} - 12 x^{2} + 12 x^{4} + 36 x^{2} - 12 x + 4 x^{3} - 12 x^{2} + 12 x + 4 \cdot - 1$

Multiply $4$ by $- 1$ .

$4 x^{6} - 12 x^{5} + 12 x^{4} - 4 x^{3} + 12 x^{5} - 36 x^{4} - 12 x^{2} + 12 x^{4} + 36 x^{2} - 12 x + 4 x^{3} - 12 x^{2} + 12 x - 4$

Simplify by adding terms.

Combine the opposite terms in $4 x^{6} - 12 x^{5} + 12 x^{4} - 4 x^{3} + 12 x^{5} - 36 x^{4} - 12 x^{2} + 12 x^{4} + 36 x^{2} - 12 x + 4 x^{3} - 12 x^{2} + 12 x - 4$ .

Add $- 12 x^{5}$ and $12 x^{5}$ .

$4 x^{6} + 12 x^{4} - 4 x^{3} + 0 - 36 x^{4} - 12 x^{2} + 12 x^{4} + 36 x^{2} - 12 x + 4 x^{3} - 12 x^{2} + 12 x - 4$

Add $4 x^{6} + 12 x^{4} - 4 x^{3}$ and $0$ .

$4 x^{6} + 12 x^{4} - 4 x^{3} - 36 x^{4} - 12 x^{2} + 12 x^{4} + 36 x^{2} - 12 x + 4 x^{3} - 12 x^{2} + 12 x - 4$

Add $- 4 x^{3}$ and $4 x^{3}$ .

$4 x^{6} + 12 x^{4} - 36 x^{4} - 12 x^{2} + 12 x^{4} + 36 x^{2} - 12 x + 0 - 12 x^{2} + 12 x - 4$

Add $4 x^{6} + 12 x^{4} - 36 x^{4} - 12 x^{2} + 12 x^{4} + 36 x^{2} - 12 x$ and $0$ .

$4 x^{6} + 12 x^{4} - 36 x^{4} - 12 x^{2} + 12 x^{4} + 36 x^{2} - 12 x - 12 x^{2} + 12 x - 4$

Add $- 12 x$ and $12 x$ .

$4 x^{6} + 12 x^{4} - 36 x^{4} - 12 x^{2} + 12 x^{4} + 36 x^{2} - 12 x^{2} + 0 - 4$

Add $4 x^{6} + 12 x^{4} - 36 x^{4} - 12 x^{2} + 12 x^{4} + 36 x^{2} - 12 x^{2}$ and $0$ .

$4 x^{6} + 12 x^{4} - 36 x^{4} - 12 x^{2} + 12 x^{4} + 36 x^{2} - 12 x^{2} - 4$

Subtract $36 x^{4}$ from $12 x^{4}$ .

$4 x^{6} - 24 x^{4} - 12 x^{2} + 12 x^{4} + 36 x^{2} - 12 x^{2} - 4$

Add $- 24 x^{4}$ and $12 x^{4}$ .

$4 x^{6} - 12 x^{4} - 12 x^{2} + 36 x^{2} - 12 x^{2} - 4$

Add $- 12 x^{2}$ and $36 x^{2}$ .

$4 x^{6} - 12 x^{4} + 24 x^{2} - 12 x^{2} - 4$

Subtract $12 x^{2}$ from $24 x^{2}$ .

$4 x^{6} - 12 x^{4} + 12 x^{2} - 4$

Evaluate fourth root of 256(x^2-1)^12

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