Find h(f(x)) f(x)=5x^2+2x-5 , g(x)=7x+8 , h(x)=4x^2-10

$f (x) = 5 x^{2} + 2 x - 5$ , $g (x) = 7 x + 8$ , $h (x) = 4 x^{2} - 10$

Set up the composite result function.

$h (f (x))$

Evaluate $h (5 x^{2} + 2 x - 5)$ by substituting in the value of $f$ into $h$ .

$h (5 x^{2} + 2 x - 5) = 4 {(5 x^{2} + 2 x - 5)}^{2} - 10$

Simplify each term.

Rewrite ${(5 x^{2} + 2 x - 5)}^{2}$ as $(5 x^{2} + 2 x - 5) (5 x^{2} + 2 x - 5)$ .

$h (5 x^{2} + 2 x - 5) = 4 ((5 x^{2} + 2 x - 5) (5 x^{2} + 2 x - 5)) - 10$

Expand $(5 x^{2} + 2 x - 5) (5 x^{2} + 2 x - 5)$ by multiplying each term in the first expression by each term in the second expression.

$h (5 x^{2} + 2 x - 5) = 4 (5 x^{2} (5 x^{2}) + 5 x^{2} (2 x) + 5 x^{2} \cdot - 5 + 2 x (5 x^{2}) + 2 x (2 x) + 2 x \cdot - 5 - 5 (5 x^{2}) - 5 (2 x) - 5 \cdot - 5) - 10$

Simplify each term.

Rewrite using the commutative property of multiplication.

$h (5 x^{2} + 2 x - 5) = 4 (5 \cdot (5 x^{2} x^{2}) + 5 x^{2} (2 x) + 5 x^{2} \cdot - 5 + 2 x (5 x^{2}) + 2 x (2 x) + 2 x \cdot - 5 - 5 (5 x^{2}) - 5 (2 x) - 5 \cdot - 5) - 10$

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

Move $x^{2}$ .

$h (5 x^{2} + 2 x - 5) = 4 (5 \cdot (5 (x^{2} x^{2})) + 5 x^{2} (2 x) + 5 x^{2} \cdot - 5 + 2 x (5 x^{2}) + 2 x (2 x) + 2 x \cdot - 5 - 5 (5 x^{2}) - 5 (2 x) - 5 \cdot - 5) - 10$

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

$h (5 x^{2} + 2 x - 5) = 4 (5 \cdot (5 x^{2 + 2}) + 5 x^{2} (2 x) + 5 x^{2} \cdot - 5 + 2 x (5 x^{2}) + 2 x (2 x) + 2 x \cdot - 5 - 5 (5 x^{2}) - 5 (2 x) - 5 \cdot - 5) - 10$

Add $2$ and $2$ .

$h (5 x^{2} + 2 x - 5) = 4 (5 \cdot (5 x^{4}) + 5 x^{2} (2 x) + 5 x^{2} \cdot - 5 + 2 x (5 x^{2}) + 2 x (2 x) + 2 x \cdot - 5 - 5 (5 x^{2}) - 5 (2 x) - 5 \cdot - 5) - 10$

Multiply $5$ by $5$ .

$h (5 x^{2} + 2 x - 5) = 4 (25 x^{4} + 5 x^{2} (2 x) + 5 x^{2} \cdot - 5 + 2 x (5 x^{2}) + 2 x (2 x) + 2 x \cdot - 5 - 5 (5 x^{2}) - 5 (2 x) - 5 \cdot - 5) - 10$

Rewrite using the commutative property of multiplication.

$h (5 x^{2} + 2 x - 5) = 4 (25 x^{4} + 5 \cdot (2 x^{2} x) + 5 x^{2} \cdot - 5 + 2 x (5 x^{2}) + 2 x (2 x) + 2 x \cdot - 5 - 5 (5 x^{2}) - 5 (2 x) - 5 \cdot - 5) - 10$

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

Move $x$ .

$h (5 x^{2} + 2 x - 5) = 4 (25 x^{4} + 5 \cdot (2 (x \cdot x^{2})) + 5 x^{2} \cdot - 5 + 2 x (5 x^{2}) + 2 x (2 x) + 2 x \cdot - 5 - 5 (5 x^{2}) - 5 (2 x) - 5 \cdot - 5) - 10$

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

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

$h (5 x^{2} + 2 x - 5) = 4 (25 x^{4} + 5 \cdot (2 (x \cdot x^{2})) + 5 x^{2} \cdot - 5 + 2 x (5 x^{2}) + 2 x (2 x) + 2 x \cdot - 5 - 5 (5 x^{2}) - 5 (2 x) - 5 \cdot - 5) - 10$

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

$h (5 x^{2} + 2 x - 5) = 4 (25 x^{4} + 5 \cdot (2 x^{1 + 2}) + 5 x^{2} \cdot - 5 + 2 x (5 x^{2}) + 2 x (2 x) + 2 x \cdot - 5 - 5 (5 x^{2}) - 5 (2 x) - 5 \cdot - 5) - 10$

Add $1$ and $2$ .

$h (5 x^{2} + 2 x - 5) = 4 (25 x^{4} + 5 \cdot (2 x^{3}) + 5 x^{2} \cdot - 5 + 2 x (5 x^{2}) + 2 x (2 x) + 2 x \cdot - 5 - 5 (5 x^{2}) - 5 (2 x) - 5 \cdot - 5) - 10$

Multiply $5$ by $2$ .

$h (5 x^{2} + 2 x - 5) = 4 (25 x^{4} + 10 x^{3} + 5 x^{2} \cdot - 5 + 2 x (5 x^{2}) + 2 x (2 x) + 2 x \cdot - 5 - 5 (5 x^{2}) - 5 (2 x) - 5 \cdot - 5) - 10$

Multiply $- 5$ by $5$ .

$h (5 x^{2} + 2 x - 5) = 4 (25 x^{4} + 10 x^{3} - 25 x^{2} + 2 x (5 x^{2}) + 2 x (2 x) + 2 x \cdot - 5 - 5 (5 x^{2}) - 5 (2 x) - 5 \cdot - 5) - 10$

Rewrite using the commutative property of multiplication.

$h (5 x^{2} + 2 x - 5) = 4 (25 x^{4} + 10 x^{3} - 25 x^{2} + 2 \cdot (5 x \cdot x^{2}) + 2 x (2 x) + 2 x \cdot - 5 - 5 (5 x^{2}) - 5 (2 x) - 5 \cdot - 5) - 10$

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

Move $x^{2}$ .

$h (5 x^{2} + 2 x - 5) = 4 (25 x^{4} + 10 x^{3} - 25 x^{2} + 2 \cdot (5 (x^{2} x)) + 2 x (2 x) + 2 x \cdot - 5 - 5 (5 x^{2}) - 5 (2 x) - 5 \cdot - 5) - 10$

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

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

$h (5 x^{2} + 2 x - 5) = 4 (25 x^{4} + 10 x^{3} - 25 x^{2} + 2 \cdot (5 (x^{2} x)) + 2 x (2 x) + 2 x \cdot - 5 - 5 (5 x^{2}) - 5 (2 x) - 5 \cdot - 5) - 10$

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

$h (5 x^{2} + 2 x - 5) = 4 (25 x^{4} + 10 x^{3} - 25 x^{2} + 2 \cdot (5 x^{2 + 1}) + 2 x (2 x) + 2 x \cdot - 5 - 5 (5 x^{2}) - 5 (2 x) - 5 \cdot - 5) - 10$

Add $2$ and $1$ .

$h (5 x^{2} + 2 x - 5) = 4 (25 x^{4} + 10 x^{3} - 25 x^{2} + 2 \cdot (5 x^{3}) + 2 x (2 x) + 2 x \cdot - 5 - 5 (5 x^{2}) - 5 (2 x) - 5 \cdot - 5) - 10$

Multiply $2$ by $5$ .

$h (5 x^{2} + 2 x - 5) = 4 (25 x^{4} + 10 x^{3} - 25 x^{2} + 10 x^{3} + 2 x (2 x) + 2 x \cdot - 5 - 5 (5 x^{2}) - 5 (2 x) - 5 \cdot - 5) - 10$

Rewrite using the commutative property of multiplication.

$h (5 x^{2} + 2 x - 5) = 4 (25 x^{4} + 10 x^{3} - 25 x^{2} + 10 x^{3} + 2 \cdot (2 x \cdot x) + 2 x \cdot - 5 - 5 (5 x^{2}) - 5 (2 x) - 5 \cdot - 5) - 10$

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

Move $x$ .

$h (5 x^{2} + 2 x - 5) = 4 (25 x^{4} + 10 x^{3} - 25 x^{2} + 10 x^{3} + 2 \cdot (2 (x \cdot x)) + 2 x \cdot - 5 - 5 (5 x^{2}) - 5 (2 x) - 5 \cdot - 5) - 10$

Multiply $x$ by $x$ .

$h (5 x^{2} + 2 x - 5) = 4 (25 x^{4} + 10 x^{3} - 25 x^{2} + 10 x^{3} + 2 \cdot (2 x^{2}) + 2 x \cdot - 5 - 5 (5 x^{2}) - 5 (2 x) - 5 \cdot - 5) - 10$

Multiply $2$ by $2$ .

$h (5 x^{2} + 2 x - 5) = 4 (25 x^{4} + 10 x^{3} - 25 x^{2} + 10 x^{3} + 4 x^{2} + 2 x \cdot - 5 - 5 (5 x^{2}) - 5 (2 x) - 5 \cdot - 5) - 10$

Multiply $- 5$ by $2$ .

$h (5 x^{2} + 2 x - 5) = 4 (25 x^{4} + 10 x^{3} - 25 x^{2} + 10 x^{3} + 4 x^{2} - 10 x - 5 (5 x^{2}) - 5 (2 x) - 5 \cdot - 5) - 10$

Multiply $5$ by $- 5$ .

$h (5 x^{2} + 2 x - 5) = 4 (25 x^{4} + 10 x^{3} - 25 x^{2} + 10 x^{3} + 4 x^{2} - 10 x - 25 x^{2} - 5 (2 x) - 5 \cdot - 5) - 10$

Multiply $2$ by $- 5$ .

$h (5 x^{2} + 2 x - 5) = 4 (25 x^{4} + 10 x^{3} - 25 x^{2} + 10 x^{3} + 4 x^{2} - 10 x - 25 x^{2} - 10 x - 5 \cdot - 5) - 10$

Multiply $- 5$ by $- 5$ .

$h (5 x^{2} + 2 x - 5) = 4 (25 x^{4} + 10 x^{3} - 25 x^{2} + 10 x^{3} + 4 x^{2} - 10 x - 25 x^{2} - 10 x + 25) - 10$

Add $10 x^{3}$ and $10 x^{3}$ .

$h (5 x^{2} + 2 x - 5) = 4 (25 x^{4} + 20 x^{3} - 25 x^{2} + 4 x^{2} - 10 x - 25 x^{2} - 10 x + 25) - 10$

Add $- 25 x^{2}$ and $4 x^{2}$ .

$h (5 x^{2} + 2 x - 5) = 4 (25 x^{4} + 20 x^{3} - 21 x^{2} - 10 x - 25 x^{2} - 10 x + 25) - 10$

Subtract $25 x^{2}$ from $- 21 x^{2}$ .

$h (5 x^{2} + 2 x - 5) = 4 (25 x^{4} + 20 x^{3} - 46 x^{2} - 10 x - 10 x + 25) - 10$

Subtract $10 x$ from $- 10 x$ .

$h (5 x^{2} + 2 x - 5) = 4 (25 x^{4} + 20 x^{3} - 46 x^{2} - 20 x + 25) - 10$

Apply the distributive property.

$h (5 x^{2} + 2 x - 5) = 4 (25 x^{4}) + 4 (20 x^{3}) + 4 (- 46 x^{2}) + 4 (- 20 x) + 4 \cdot 25 - 10$

Simplify.

Multiply $25$ by $4$ .

$h (5 x^{2} + 2 x - 5) = 100 x^{4} + 4 (20 x^{3}) + 4 (- 46 x^{2}) + 4 (- 20 x) + 4 \cdot 25 - 10$

Multiply $20$ by $4$ .

$h (5 x^{2} + 2 x - 5) = 100 x^{4} + 80 x^{3} + 4 (- 46 x^{2}) + 4 (- 20 x) + 4 \cdot 25 - 10$

Multiply $- 46$ by $4$ .

$h (5 x^{2} + 2 x - 5) = 100 x^{4} + 80 x^{3} - 184 x^{2} + 4 (- 20 x) + 4 \cdot 25 - 10$

Multiply $- 20$ by $4$ .

$h (5 x^{2} + 2 x - 5) = 100 x^{4} + 80 x^{3} - 184 x^{2} - 80 x + 4 \cdot 25 - 10$

Multiply $4$ by $25$ .

$h (5 x^{2} + 2 x - 5) = 100 x^{4} + 80 x^{3} - 184 x^{2} - 80 x + 100 - 10$

Subtract $10$ from $100$ .

$h (5 x^{2} + 2 x - 5) = 100 x^{4} + 80 x^{3} - 184 x^{2} - 80 x + 90$

Find h(f(x)) f(x)=5x^2+2x-5 , g(x)=7x+8 , h(x)=4x^2-10

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