Calculus Examples

$f (x) = 5 x {(x^{4} + 1)}^{5}$

Step 1

Since $5$ is constant with respect to $x$ , the derivative of $5 x {(x^{4} + 1)}^{5}$ with respect to $x$ is $5 \frac{d}{d x} [x {(x^{4} + 1)}^{5}]$ .

$5 \frac{d}{d x} [x {(x^{4} + 1)}^{5}]$

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 $g (x) = {(x^{4} + 1)}^{5}$ .

$5 (x \frac{d}{d x} [{(x^{4} + 1)}^{5}] + {(x^{4} + 1)}^{5} \frac{d}{d x} [x])$

Step 3

Differentiate using the chain rule, which states that $\frac{d}{d x} [f (g (x))]$ is $f' (g (x)) g' (x)$ where $f (x) = x^{5}$ and $g (x) = x^{4} + 1$ .

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Step 3.1

To apply the Chain Rule, set $u$ as $x^{4} + 1$ .

$5 (x (\frac{d}{d u} [u^{5}] \frac{d}{d x} [x^{4} + 1]) + {(x^{4} + 1)}^{5} \frac{d}{d x} [x])$

Step 3.2

Differentiate using the Power Rule which states that $\frac{d}{d u} [u^{n}]$ is $n u^{n - 1}$ where $n = 5$ .

$5 (x (5 u^{4} \frac{d}{d x} [x^{4} + 1]) + {(x^{4} + 1)}^{5} \frac{d}{d x} [x])$

Step 3.3

Replace all occurrences of $u$ with $x^{4} + 1$ .

$5 (x (5 {(x^{4} + 1)}^{4} \frac{d}{d x} [x^{4} + 1]) + {(x^{4} + 1)}^{5} \frac{d}{d x} [x])$

Step 4

Differentiate.

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Step 4.1

By the Sum Rule, the derivative of $x^{4} + 1$ with respect to $x$ is $\frac{d}{d x} [x^{4}] + \frac{d}{d x} [1]$ .

$5 (x (5 {(x^{4} + 1)}^{4} (\frac{d}{d x} [x^{4}] + \frac{d}{d x} [1])) + {(x^{4} + 1)}^{5} \frac{d}{d x} [x])$

Step 4.2

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

$5 (x (5 {(x^{4} + 1)}^{4} (4 x^{3} + \frac{d}{d x} [1])) + {(x^{4} + 1)}^{5} \frac{d}{d x} [x])$

Step 4.3

Since $1$ is constant with respect to $x$ , the derivative of $1$ with respect to $x$ is $0$ .

$5 (x (5 {(x^{4} + 1)}^{4} (4 x^{3} + 0)) + {(x^{4} + 1)}^{5} \frac{d}{d x} [x])$

Step 4.4

Simplify the expression.

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Step 4.4.1

Add $4 x^{3}$ and $0$ .

$5 (x (5 {(x^{4} + 1)}^{4} (4 x^{3})) + {(x^{4} + 1)}^{5} \frac{d}{d x} [x])$

Step 4.4.2

Multiply $4$ by $5$ .

$5 (x (20 {(x^{4} + 1)}^{4} x^{3}) + {(x^{4} + 1)}^{5} \frac{d}{d x} [x])$

Step 5

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

$5 (x^{3} x^{1} (20 {(x^{4} + 1)}^{4}) + {(x^{4} + 1)}^{5} \frac{d}{d x} [x])$

Step 6

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

$5 (x^{3 + 1} (20 {(x^{4} + 1)}^{4}) + {(x^{4} + 1)}^{5} \frac{d}{d x} [x])$

Step 7

Add $3$ and $1$ .

$5 (x^{4} (20 {(x^{4} + 1)}^{4}) + {(x^{4} + 1)}^{5} \frac{d}{d x} [x])$

Step 8

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

$5 (x^{4} (20 {(x^{4} + 1)}^{4}) + {(x^{4} + 1)}^{5} \cdot 1)$

Step 9

Multiply ${(x^{4} + 1)}^{5}$ by $1$ .

$5 (x^{4} (20 {(x^{4} + 1)}^{4}) + {(x^{4} + 1)}^{5})$

Step 10

Simplify.

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Step 10.1

Apply the distributive property.

$5 (x^{4} (20 {(x^{4} + 1)}^{4})) + 5 {(x^{4} + 1)}^{5}$

Step 10.2

Multiply $20$ by $5$ .

$100 (x^{4} ({(x^{4} + 1)}^{4})) + 5 {(x^{4} + 1)}^{5}$

Step 10.3

Factor $5 {(x^{4} + 1)}^{4}$ out of $100 x^{4} {(x^{4} + 1)}^{4} + 5 {(x^{4} + 1)}^{5}$ .

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Step 10.3.1

Factor $5 {(x^{4} + 1)}^{4}$ out of $100 x^{4} {(x^{4} + 1)}^{4}$ .

$5 {(x^{4} + 1)}^{4} (20 x^{4}) + 5 {(x^{4} + 1)}^{5}$

Step 10.3.2

Factor $5 {(x^{4} + 1)}^{4}$ out of $5 {(x^{4} + 1)}^{5}$ .

$5 {(x^{4} + 1)}^{4} (20 x^{4}) + 5 {(x^{4} + 1)}^{4} (x^{4} + 1)$

Step 10.3.3

Factor $5 {(x^{4} + 1)}^{4}$ out of $5 {(x^{4} + 1)}^{4} (20 x^{4}) + 5 {(x^{4} + 1)}^{4} (x^{4} + 1)$ .

$5 {(x^{4} + 1)}^{4} (20 x^{4} + x^{4} + 1)$

Step 10.4

Add $20 x^{4}$ and $x^{4}$ .

$5 {(x^{4} + 1)}^{4} (21 x^{4} + 1)$