Algebra Examples

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

Step 1

Set up the composite result function.

$h (f (x))$

Step 2

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

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

Step 3

Simplify each term.

Tap for more steps...

Step 3.1

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

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

Step 3.2

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.

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

Step 3.3

Simplify each term.

Tap for more steps...

Step 3.3.1

Rewrite using the commutative property of multiplication.

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

Step 3.3.2

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

Tap for more steps...

Step 3.3.2.1

Move $x^{2}$ .

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

Step 3.3.2.2

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

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

Step 3.3.2.3

Add $2$ and $2$ .

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

Step 3.3.3

Multiply $5$ by $5$ .

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

Step 3.3.4

Rewrite using the commutative property of multiplication.

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

Step 3.3.5

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

Tap for more steps...

Step 3.3.5.1

Move $x$ .

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

Step 3.3.5.2

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

Tap for more steps...

Step 3.3.5.2.1

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

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

Step 3.3.5.2.2

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

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

Step 3.3.5.3

Add $1$ and $2$ .

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

Step 3.3.6

Multiply $5$ by $2$ .

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

Step 3.3.7

Multiply $- 5$ by $5$ .

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

Step 3.3.8

Rewrite using the commutative property of multiplication.

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

Step 3.3.9

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

Tap for more steps...

Step 3.3.9.1

Move $x^{2}$ .

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

Step 3.3.9.2

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

Tap for more steps...

Step 3.3.9.2.1

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

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

Step 3.3.9.2.2

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

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

Step 3.3.9.3

Add $2$ and $1$ .

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

Step 3.3.10

Multiply $2$ by $5$ .

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

Step 3.3.11

Rewrite using the commutative property of multiplication.

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

Step 3.3.12

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

Tap for more steps...

Step 3.3.12.1

Move $x$ .

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

Step 3.3.12.2

Multiply $x$ by $x$ .

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

Step 3.3.13

Multiply $2$ by $2$ .

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

Step 3.3.14

Multiply $- 5$ by $2$ .

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

Step 3.3.15

Multiply $5$ by $- 5$ .

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

Step 3.3.16

Multiply $2$ by $- 5$ .

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

Step 3.3.17

Multiply $- 5$ by $- 5$ .

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

Step 3.4

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

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

Step 3.5

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

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

Step 3.6

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

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

Step 3.7

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

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

Step 3.8

Apply the distributive property.

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

Step 3.9

Simplify.

Tap for more steps...

Step 3.9.1

Multiply $25$ by $4$ .

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

Step 3.9.2

Multiply $20$ by $4$ .

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

Step 3.9.3

Multiply $- 46$ by $4$ .

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

Step 3.9.4

Multiply $- 20$ by $4$ .

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

Step 3.9.5

Multiply $4$ by $25$ .

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

Step 4

Subtract $10$ from $100$ .

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