Precalculus Examples

$y = (- 2 x^{4} + 5 x^{2} + 4) (- 3 x^{2} + 2)$

Step 1

Differentiate using the Product Rule which states that $\frac{d}{d x} [f (x) g (x)]$ is $f (x) \frac{d}{d x} [g (x)] + g (x) \frac{d}{d x} [f (x)]$ where $f (x) = - 2 x^{4} + 5 x^{2} + 4$ and $g (x) = - 3 x^{2} + 2$ .

$(- 2 x^{4} + 5 x^{2} + 4) \frac{d}{d x} [- 3 x^{2} + 2] + (- 3 x^{2} + 2) \frac{d}{d x} [- 2 x^{4} + 5 x^{2} + 4]$

Step 2

By the Sum Rule, the derivative of $- 3 x^{2} + 2$ with respect to $x$ is $\frac{d}{d x} [- 3 x^{2}] + \frac{d}{d x} [2]$ .

$(- 2 x^{4} + 5 x^{2} + 4) (\frac{d}{d x} [- 3 x^{2}] + \frac{d}{d x} [2]) + (- 3 x^{2} + 2) \frac{d}{d x} [- 2 x^{4} + 5 x^{2} + 4]$

Step 3

Evaluate $\frac{d}{d x} [- 3 x^{2}]$ .

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Step 3.1

Since $- 3$ is constant with respect to $x$ , the derivative of $- 3 x^{2}$ with respect to $x$ is $- 3 \frac{d}{d x} [x^{2}]$ .

$(- 2 x^{4} + 5 x^{2} + 4) (- 3 \frac{d}{d x} [x^{2}] + \frac{d}{d x} [2]) + (- 3 x^{2} + 2) \frac{d}{d x} [- 2 x^{4} + 5 x^{2} + 4]$

Step 3.2

Differentiate using the Power Rule which states that $\frac{d}{d x} [x^{n}]$ is $n x^{n - 1}$ where $n = 2$ .

$(- 2 x^{4} + 5 x^{2} + 4) (- 3 (2 x) + \frac{d}{d x} [2]) + (- 3 x^{2} + 2) \frac{d}{d x} [- 2 x^{4} + 5 x^{2} + 4]$

Step 3.3

Multiply $2$ by $- 3$ .

$(- 2 x^{4} + 5 x^{2} + 4) (- 6 x + \frac{d}{d x} [2]) + (- 3 x^{2} + 2) \frac{d}{d x} [- 2 x^{4} + 5 x^{2} + 4]$

Step 4

Differentiate.

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Step 4.1

Since $2$ is constant with respect to $x$ , the derivative of $2$ with respect to $x$ is $0$ .

$(- 2 x^{4} + 5 x^{2} + 4) (- 6 x + 0) + (- 3 x^{2} + 2) \frac{d}{d x} [- 2 x^{4} + 5 x^{2} + 4]$

Step 4.2

Add $- 6 x$ and $0$ .

$(- 2 x^{4} + 5 x^{2} + 4) (- 6 x) + (- 3 x^{2} + 2) \frac{d}{d x} [- 2 x^{4} + 5 x^{2} + 4]$

Step 4.3

By the Sum Rule, the derivative of $- 2 x^{4} + 5 x^{2} + 4$ with respect to $x$ is $\frac{d}{d x} [- 2 x^{4}] + \frac{d}{d x} [5 x^{2}] + \frac{d}{d x} [4]$ .

$(- 2 x^{4} + 5 x^{2} + 4) (- 6 x) + (- 3 x^{2} + 2) (\frac{d}{d x} [- 2 x^{4}] + \frac{d}{d x} [5 x^{2}] + \frac{d}{d x} [4])$

Step 5

Evaluate $\frac{d}{d x} [- 2 x^{4}]$ .

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Step 5.1

Since $- 2$ is constant with respect to $x$ , the derivative of $- 2 x^{4}$ with respect to $x$ is $- 2 \frac{d}{d x} [x^{4}]$ .

$(- 2 x^{4} + 5 x^{2} + 4) (- 6 x) + (- 3 x^{2} + 2) (- 2 \frac{d}{d x} [x^{4}] + \frac{d}{d x} [5 x^{2}] + \frac{d}{d x} [4])$

Step 5.2

Differentiate using the Power Rule which states that $\frac{d}{d x} [x^{n}]$ is $n x^{n - 1}$ where $n = 4$ .

$(- 2 x^{4} + 5 x^{2} + 4) (- 6 x) + (- 3 x^{2} + 2) (- 2 (4 x^{3}) + \frac{d}{d x} [5 x^{2}] + \frac{d}{d x} [4])$

Step 5.3

Multiply $4$ by $- 2$ .

$(- 2 x^{4} + 5 x^{2} + 4) (- 6 x) + (- 3 x^{2} + 2) (- 8 x^{3} + \frac{d}{d x} [5 x^{2}] + \frac{d}{d x} [4])$

Step 6

Evaluate $\frac{d}{d x} [5 x^{2}]$ .

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Step 6.1

Since $5$ is constant with respect to $x$ , the derivative of $5 x^{2}$ with respect to $x$ is $5 \frac{d}{d x} [x^{2}]$ .

$(- 2 x^{4} + 5 x^{2} + 4) (- 6 x) + (- 3 x^{2} + 2) (- 8 x^{3} + 5 \frac{d}{d x} [x^{2}] + \frac{d}{d x} [4])$

Step 6.2

Differentiate using the Power Rule which states that $\frac{d}{d x} [x^{n}]$ is $n x^{n - 1}$ where $n = 2$ .

$(- 2 x^{4} + 5 x^{2} + 4) (- 6 x) + (- 3 x^{2} + 2) (- 8 x^{3} + 5 (2 x) + \frac{d}{d x} [4])$

Step 6.3

Multiply $2$ by $5$ .

$(- 2 x^{4} + 5 x^{2} + 4) (- 6 x) + (- 3 x^{2} + 2) (- 8 x^{3} + 10 x + \frac{d}{d x} [4])$

Step 7

Differentiate using the Constant Rule.

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Step 7.1

Since $4$ is constant with respect to $x$ , the derivative of $4$ with respect to $x$ is $0$ .

$(- 2 x^{4} + 5 x^{2} + 4) (- 6 x) + (- 3 x^{2} + 2) (- 8 x^{3} + 10 x + 0)$

Step 7.2

Add $- 8 x^{3} + 10 x$ and $0$ .

$(- 2 x^{4} + 5 x^{2} + 4) (- 6 x) + (- 3 x^{2} + 2) (- 8 x^{3} + 10 x)$

Step 8

Simplify.

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Step 8.1

Apply the distributive property.

$- 2 x^{4} (- 6 x) + 5 x^{2} (- 6 x) + 4 (- 6 x) + (- 3 x^{2} + 2) (- 8 x^{3} + 10 x)$

Step 8.2

Apply the distributive property.

$- 2 x^{4} (- 6 x) + 5 x^{2} (- 6 x) + 4 (- 6 x) + (- 3 x^{2} + 2) (- 8 x^{3}) + (- 3 x^{2} + 2) (10 x)$

Step 8.3

Apply the distributive property.

$- 2 x^{4} (- 6 x) + 5 x^{2} (- 6 x) + 4 (- 6 x) - 3 x^{2} (- 8 x^{3}) + 2 (- 8 x^{3}) + (- 3 x^{2} + 2) (10 x)$

Step 8.4

Apply the distributive property.

$- 2 x^{4} (- 6 x) + 5 x^{2} (- 6 x) + 4 (- 6 x) - 3 x^{2} (- 8 x^{3}) + 2 (- 8 x^{3}) - 3 x^{2} (10 x) + 2 (10 x)$

Step 8.5

Combine terms.

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Step 8.5.1

Multiply $- 6$ by $- 2$ .

$12 x^{4} x + 5 x^{2} (- 6 x) + 4 (- 6 x) - 3 x^{2} (- 8 x^{3}) + 2 (- 8 x^{3}) - 3 x^{2} (10 x) + 2 (10 x)$

Step 8.5.2

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

$12 (x^{1} x^{4}) + 5 x^{2} (- 6 x) + 4 (- 6 x) - 3 x^{2} (- 8 x^{3}) + 2 (- 8 x^{3}) - 3 x^{2} (10 x) + 2 (10 x)$

Step 8.5.3

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

$12 x^{1 + 4} + 5 x^{2} (- 6 x) + 4 (- 6 x) - 3 x^{2} (- 8 x^{3}) + 2 (- 8 x^{3}) - 3 x^{2} (10 x) + 2 (10 x)$

Step 8.5.4

Add $1$ and $4$ .

$12 x^{5} + 5 x^{2} (- 6 x) + 4 (- 6 x) - 3 x^{2} (- 8 x^{3}) + 2 (- 8 x^{3}) - 3 x^{2} (10 x) + 2 (10 x)$

Step 8.5.5

Multiply $- 6$ by $5$ .

$12 x^{5} - 30 x^{2} x + 4 (- 6 x) - 3 x^{2} (- 8 x^{3}) + 2 (- 8 x^{3}) - 3 x^{2} (10 x) + 2 (10 x)$

Step 8.5.6

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

$12 x^{5} - 30 (x^{1} x^{2}) + 4 (- 6 x) - 3 x^{2} (- 8 x^{3}) + 2 (- 8 x^{3}) - 3 x^{2} (10 x) + 2 (10 x)$

Step 8.5.7

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

$12 x^{5} - 30 x^{1 + 2} + 4 (- 6 x) - 3 x^{2} (- 8 x^{3}) + 2 (- 8 x^{3}) - 3 x^{2} (10 x) + 2 (10 x)$

Step 8.5.8

Add $1$ and $2$ .

$12 x^{5} - 30 x^{3} + 4 (- 6 x) - 3 x^{2} (- 8 x^{3}) + 2 (- 8 x^{3}) - 3 x^{2} (10 x) + 2 (10 x)$

Step 8.5.9

Multiply $- 6$ by $4$ .

$12 x^{5} - 30 x^{3} - 24 x - 3 x^{2} (- 8 x^{3}) + 2 (- 8 x^{3}) - 3 x^{2} (10 x) + 2 (10 x)$

Step 8.5.10

Multiply $- 8$ by $- 3$ .

$12 x^{5} - 30 x^{3} - 24 x + 24 x^{2} x^{3} + 2 (- 8 x^{3}) - 3 x^{2} (10 x) + 2 (10 x)$

Step 8.5.11

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

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Step 8.5.11.1

Move $x^{3}$ .

$12 x^{5} - 30 x^{3} - 24 x + 24 (x^{3} x^{2}) + 2 (- 8 x^{3}) - 3 x^{2} (10 x) + 2 (10 x)$

Step 8.5.11.2

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

$12 x^{5} - 30 x^{3} - 24 x + 24 x^{3 + 2} + 2 (- 8 x^{3}) - 3 x^{2} (10 x) + 2 (10 x)$

Step 8.5.11.3

Add $3$ and $2$ .

$12 x^{5} - 30 x^{3} - 24 x + 24 x^{5} + 2 (- 8 x^{3}) - 3 x^{2} (10 x) + 2 (10 x)$

Step 8.5.12

Multiply $- 8$ by $2$ .

$12 x^{5} - 30 x^{3} - 24 x + 24 x^{5} - 16 x^{3} - 3 x^{2} (10 x) + 2 (10 x)$

Step 8.5.13

Multiply $10$ by $- 3$ .

$12 x^{5} - 30 x^{3} - 24 x + 24 x^{5} - 16 x^{3} - 30 x^{2} x + 2 (10 x)$

Step 8.5.14

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

$12 x^{5} - 30 x^{3} - 24 x + 24 x^{5} - 16 x^{3} - 30 (x^{1} x^{2}) + 2 (10 x)$

Step 8.5.15

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

$12 x^{5} - 30 x^{3} - 24 x + 24 x^{5} - 16 x^{3} - 30 x^{1 + 2} + 2 (10 x)$

Step 8.5.16

Add $1$ and $2$ .

$12 x^{5} - 30 x^{3} - 24 x + 24 x^{5} - 16 x^{3} - 30 x^{3} + 2 (10 x)$

Step 8.5.17

Multiply $10$ by $2$ .

$12 x^{5} - 30 x^{3} - 24 x + 24 x^{5} - 16 x^{3} - 30 x^{3} + 20 x$

Step 8.5.18

Subtract $30 x^{3}$ from $- 16 x^{3}$ .

$12 x^{5} - 30 x^{3} - 24 x + 24 x^{5} - 46 x^{3} + 20 x$

Step 8.5.19

Add $12 x^{5}$ and $24 x^{5}$ .

$36 x^{5} - 30 x^{3} - 24 x - 46 x^{3} + 20 x$

Step 8.5.20

Subtract $46 x^{3}$ from $- 30 x^{3}$ .

$36 x^{5} - 76 x^{3} - 24 x + 20 x$

Step 8.5.21

Add $- 24 x$ and $20 x$ .

$36 x^{5} - 76 x^{3} - 4 x$