Find f(g(x)) f(x)=2x^2-4x-3 , g(x)=(x-4)(x+4)

$f (x) = 2 x^{2} - 4 x - 3$ , $g (x) = (x - 4) (x + 4)$

Set up the composite result function.

$f (g (x))$

Evaluate $f (g (x))$ by substituting in the value of $g$ into $f$ .

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

Simplify each term.

Tap for more steps…

Expand $(x - 4) (x + 4)$ using the FOIL Method.

Tap for more steps…

Apply the distributive property.

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

Apply the distributive property.

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

Apply the distributive property.

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

Combine the opposite terms in $x \cdot x + x \cdot 4 - 4 x - 4 \cdot 4$ .

Tap for more steps…

Reorder the factors in the terms $x \cdot 4$ and $- 4 x$ .

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

Subtract $4 x$ from $4 x$ .

$f ((x - 4) (x + 4)) = 2 {(x \cdot x + 0 - 4 \cdot 4)}^{2} - 4 ((x - 4) (x + 4)) - 3$

Add $x \cdot x$ and $0$ .

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

Simplify each term.

Tap for more steps…

Multiply $x$ by $x$ .

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

Multiply $- 4$ by $4$ .

$f ((x - 4) (x + 4)) = 2 {(x^{2} - 16)}^{2} - 4 ((x - 4) (x + 4)) - 3$

Rewrite ${(x^{2} - 16)}^{2}$ as $(x^{2} - 16) (x^{2} - 16)$ .

$f ((x - 4) (x + 4)) = 2 ((x^{2} - 16) (x^{2} - 16)) - 4 ((x - 4) (x + 4)) - 3$

Expand $(x^{2} - 16) (x^{2} - 16)$ using the FOIL Method.

Tap for more steps…

Apply the distributive property.

$f ((x - 4) (x + 4)) = 2 (x^{2} (x^{2} - 16) - 16 (x^{2} - 16)) - 4 ((x - 4) (x + 4)) - 3$

Apply the distributive property.

$f ((x - 4) (x + 4)) = 2 (x^{2} x^{2} + x^{2} \cdot - 16 - 16 (x^{2} - 16)) - 4 ((x - 4) (x + 4)) - 3$

Apply the distributive property.

$f ((x - 4) (x + 4)) = 2 (x^{2} x^{2} + x^{2} \cdot - 16 - 16 x^{2} - 16 \cdot - 16) - 4 ((x - 4) (x + 4)) - 3$

Simplify and combine like terms.

Tap for more steps…

Simplify each term.

Tap for more steps…

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

Tap for more steps…

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

$f ((x - 4) (x + 4)) = 2 (x^{2 + 2} + x^{2} \cdot - 16 - 16 x^{2} - 16 \cdot - 16) - 4 ((x - 4) (x + 4)) - 3$

Add $2$ and $2$ .

$f ((x - 4) (x + 4)) = 2 (x^{4} + x^{2} \cdot - 16 - 16 x^{2} - 16 \cdot - 16) - 4 ((x - 4) (x + 4)) - 3$

Move $- 16$ to the left of $x^{2}$ .

$f ((x - 4) (x + 4)) = 2 (x^{4} - 16 \cdot x^{2} - 16 x^{2} - 16 \cdot - 16) - 4 ((x - 4) (x + 4)) - 3$

Multiply $- 16$ by $- 16$ .

$f ((x - 4) (x + 4)) = 2 (x^{4} - 16 x^{2} - 16 x^{2} + 256) - 4 ((x - 4) (x + 4)) - 3$

Subtract $16 x^{2}$ from $- 16 x^{2}$ .

$f ((x - 4) (x + 4)) = 2 (x^{4} - 32 x^{2} + 256) - 4 ((x - 4) (x + 4)) - 3$

Apply the distributive property.

$f ((x - 4) (x + 4)) = 2 x^{4} + 2 (- 32 x^{2}) + 2 \cdot 256 - 4 ((x - 4) (x + 4)) - 3$

Simplify.

Tap for more steps…

Multiply $- 32$ by $2$ .

$f ((x - 4) (x + 4)) = 2 x^{4} - 64 x^{2} + 2 \cdot 256 - 4 ((x - 4) (x + 4)) - 3$

Multiply $2$ by $256$ .

$f ((x - 4) (x + 4)) = 2 x^{4} - 64 x^{2} + 512 - 4 ((x - 4) (x + 4)) - 3$

Expand $(x - 4) (x + 4)$ using the FOIL Method.

Tap for more steps…

Apply the distributive property.

$f ((x - 4) (x + 4)) = 2 x^{4} - 64 x^{2} + 512 - 4 (x (x + 4) - 4 (x + 4)) - 3$

Apply the distributive property.

$f ((x - 4) (x + 4)) = 2 x^{4} - 64 x^{2} + 512 - 4 (x \cdot x + x \cdot 4 - 4 (x + 4)) - 3$

Apply the distributive property.

$f ((x - 4) (x + 4)) = 2 x^{4} - 64 x^{2} + 512 - 4 (x \cdot x + x \cdot 4 - 4 x - 4 \cdot 4) - 3$

Combine the opposite terms in $x \cdot x + x \cdot 4 - 4 x - 4 \cdot 4$ .

Tap for more steps…

Reorder the factors in the terms $x \cdot 4$ and $- 4 x$ .

$f ((x - 4) (x + 4)) = 2 x^{4} - 64 x^{2} + 512 - 4 (x \cdot x + 4 x - 4 x - 4 \cdot 4) - 3$

Subtract $4 x$ from $4 x$ .

$f ((x - 4) (x + 4)) = 2 x^{4} - 64 x^{2} + 512 - 4 (x \cdot x + 0 - 4 \cdot 4) - 3$

Add $x \cdot x$ and $0$ .

$f ((x - 4) (x + 4)) = 2 x^{4} - 64 x^{2} + 512 - 4 (x \cdot x - 4 \cdot 4) - 3$

Simplify each term.

Tap for more steps…

Multiply $x$ by $x$ .

$f ((x - 4) (x + 4)) = 2 x^{4} - 64 x^{2} + 512 - 4 (x^{2} - 4 \cdot 4) - 3$

Multiply $- 4$ by $4$ .

$f ((x - 4) (x + 4)) = 2 x^{4} - 64 x^{2} + 512 - 4 (x^{2} - 16) - 3$

Apply the distributive property.

$f ((x - 4) (x + 4)) = 2 x^{4} - 64 x^{2} + 512 - 4 x^{2} - 4 \cdot - 16 - 3$

Multiply $- 4$ by $- 16$ .

$f ((x - 4) (x + 4)) = 2 x^{4} - 64 x^{2} + 512 - 4 x^{2} + 64 - 3$

Simplify by adding terms.

Tap for more steps…

Subtract $4 x^{2}$ from $- 64 x^{2}$ .

$f ((x - 4) (x + 4)) = 2 x^{4} - 68 x^{2} + 512 + 64 - 3$

Simplify by adding and subtracting.

Tap for more steps…

Add $512$ and $64$ .

$f ((x - 4) (x + 4)) = 2 x^{4} - 68 x^{2} + 576 - 3$

Subtract $3$ from $576$ .

$f ((x - 4) (x + 4)) = 2 x^{4} - 68 x^{2} + 573$

Find f(g(x)) f(x)=2x^2-4x-3 , g(x)=(x-4)(x+4)

Need help with MATH HOMEWORK