Calculus Examples

$10 x {(x^{2} + 4)}^{4}$

Step 1

Since $10$ is constant with respect to $x$ , the derivative of $10 x {(x^{2} + 4)}^{4}$ with respect to $x$ is $10 \frac{d}{d x} [x {(x^{2} + 4)}^{4}]$ .

$10 \frac{d}{d x} [x {(x^{2} + 4)}^{4}]$

Step 2

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 $f (x) = x$ and $g (x) = {(x^{2} + 4)}^{4}$ .

$10 (x \frac{d}{d x} [{(x^{2} + 4)}^{4}] + {(x^{2} + 4)}^{4} \frac{d}{d x} [x])$

Step 3

Differentiate using the chain rule, which states that $\frac{d}{d x} [f (g (x))]$ is $f' (g (x)) g' (x)$ where $f (x) = x^{4}$ and $g (x) = x^{2} + 4$ .

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Step 3.1

To apply the Chain Rule, set $u$ as $x^{2} + 4$ .

$10 (x (\frac{d}{d u} [u^{4}] \frac{d}{d x} [x^{2} + 4]) + {(x^{2} + 4)}^{4} \frac{d}{d x} [x])$

Step 3.2

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

$10 (x (4 u^{3} \frac{d}{d x} [x^{2} + 4]) + {(x^{2} + 4)}^{4} \frac{d}{d x} [x])$

Step 3.3

Replace all occurrences of $u$ with $x^{2} + 4$ .

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

Step 4

Differentiate.

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Step 4.1

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

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

Step 4.2

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

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

Step 4.3

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

$10 (x (4 {(x^{2} + 4)}^{3} (2 x + 0)) + {(x^{2} + 4)}^{4} \frac{d}{d x} [x])$

Step 4.4

Simplify the expression.

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Step 4.4.1

Add $2 x$ and $0$ .

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

Step 4.4.2

Multiply $2$ by $4$ .

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

Step 5

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

$10 (x^{1} x (8 {(x^{2} + 4)}^{3}) + {(x^{2} + 4)}^{4} \frac{d}{d x} [x])$

Step 6

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

$10 (x^{1} x^{1} (8 {(x^{2} + 4)}^{3}) + {(x^{2} + 4)}^{4} \frac{d}{d x} [x])$

Step 7

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

$10 (x^{1 + 1} (8 {(x^{2} + 4)}^{3}) + {(x^{2} + 4)}^{4} \frac{d}{d x} [x])$

Step 8

Add $1$ and $1$ .

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

Step 9

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

$10 (x^{2} (8 {(x^{2} + 4)}^{3}) + {(x^{2} + 4)}^{4} \cdot 1)$

Step 10

Multiply ${(x^{2} + 4)}^{4}$ by $1$ .

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

Step 11

Simplify.

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Step 11.1

Apply the distributive property.

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

Step 11.2

Multiply $8$ by $10$ .

$80 (x^{2} ({(x^{2} + 4)}^{3})) + 10 {(x^{2} + 4)}^{4}$

Step 11.3

Factor $10 {(x^{2} + 4)}^{3}$ out of $80 x^{2} {(x^{2} + 4)}^{3} + 10 {(x^{2} + 4)}^{4}$ .

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Step 11.3.1

Factor $10 {(x^{2} + 4)}^{3}$ out of $80 x^{2} {(x^{2} + 4)}^{3}$ .

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

Step 11.3.2

Factor $10 {(x^{2} + 4)}^{3}$ out of $10 {(x^{2} + 4)}^{4}$ .

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

Step 11.3.3

Factor $10 {(x^{2} + 4)}^{3}$ out of $10 {(x^{2} + 4)}^{3} (8 x^{2}) + 10 {(x^{2} + 4)}^{3} (x^{2} + 4)$ .

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

Step 11.4

Add $8 x^{2}$ and $x^{2}$ .

$10 {(x^{2} + 4)}^{3} (9 x^{2} + 4)$