Calculus Examples

$f (x) = (7 x^{4} - 5 x^{3} + 6 x) \ln (x)$

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 $f (x) = 7 x^{4} - 5 x^{3} + 6 x$ and $g (x) = \ln (x)$ .

$(7 x^{4} - 5 x^{3} + 6 x) \frac{d}{d x} [\ln (x)] + \ln (x) \frac{d}{d x} [7 x^{4} - 5 x^{3} + 6 x]$

Step 2

The derivative of $\ln (x)$ with respect to $x$ is $\frac{1}{x}$ .

$(7 x^{4} - 5 x^{3} + 6 x) \frac{1}{x} + \ln (x) \frac{d}{d x} [7 x^{4} - 5 x^{3} + 6 x]$

Step 3

Differentiate.

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Step 3.1

By the Sum Rule, the derivative of $7 x^{4} - 5 x^{3} + 6 x$ with respect to $x$ is $\frac{d}{d x} [7 x^{4}] + \frac{d}{d x} [- 5 x^{3}] + \frac{d}{d x} [6 x]$ .

$(7 x^{4} - 5 x^{3} + 6 x) \frac{1}{x} + \ln (x) (\frac{d}{d x} [7 x^{4}] + \frac{d}{d x} [- 5 x^{3}] + \frac{d}{d x} [6 x])$

Step 3.2

Since $7$ is constant with respect to $x$ , the derivative of $7 x^{4}$ with respect to $x$ is $7 \frac{d}{d x} [x^{4}]$ .

$(7 x^{4} - 5 x^{3} + 6 x) \frac{1}{x} + \ln (x) (7 \frac{d}{d x} [x^{4}] + \frac{d}{d x} [- 5 x^{3}] + \frac{d}{d x} [6 x])$

Step 3.3

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

$(7 x^{4} - 5 x^{3} + 6 x) \frac{1}{x} + \ln (x) (7 (4 x^{3}) + \frac{d}{d x} [- 5 x^{3}] + \frac{d}{d x} [6 x])$

Step 3.4

Multiply $4$ by $7$ .

$(7 x^{4} - 5 x^{3} + 6 x) \frac{1}{x} + \ln (x) (28 x^{3} + \frac{d}{d x} [- 5 x^{3}] + \frac{d}{d x} [6 x])$

Step 3.5

Since $- 5$ is constant with respect to $x$ , the derivative of $- 5 x^{3}$ with respect to $x$ is $- 5 \frac{d}{d x} [x^{3}]$ .

$(7 x^{4} - 5 x^{3} + 6 x) \frac{1}{x} + \ln (x) (28 x^{3} - 5 \frac{d}{d x} [x^{3}] + \frac{d}{d x} [6 x])$

Step 3.6

Differentiate using the Power Rule which states that $\frac{d}{d x} [x^{n}]$ is $n x^{n - 1}$ where $n = 3$ .

$(7 x^{4} - 5 x^{3} + 6 x) \frac{1}{x} + \ln (x) (28 x^{3} - 5 (3 x^{2}) + \frac{d}{d x} [6 x])$

Step 3.7

Multiply $3$ by $- 5$ .

$(7 x^{4} - 5 x^{3} + 6 x) \frac{1}{x} + \ln (x) (28 x^{3} - 15 x^{2} + \frac{d}{d x} [6 x])$

Step 3.8

Since $6$ is constant with respect to $x$ , the derivative of $6 x$ with respect to $x$ is $6 \frac{d}{d x} [x]$ .

$(7 x^{4} - 5 x^{3} + 6 x) \frac{1}{x} + \ln (x) (28 x^{3} - 15 x^{2} + 6 \frac{d}{d x} [x])$

Step 3.9

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

$(7 x^{4} - 5 x^{3} + 6 x) \frac{1}{x} + \ln (x) (28 x^{3} - 15 x^{2} + 6 \cdot 1)$

Step 3.10

Multiply $6$ by $1$ .

$(7 x^{4} - 5 x^{3} + 6 x) \frac{1}{x} + \ln (x) (28 x^{3} - 15 x^{2} + 6)$

Step 4

Simplify.

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Step 4.1

Apply the distributive property.

$7 x^{4} \frac{1}{x} - 5 x^{3} \frac{1}{x} + 6 x \frac{1}{x} + \ln (x) (28 x^{3} - 15 x^{2} + 6)$

Step 4.2

Apply the distributive property.

$7 x^{4} \frac{1}{x} - 5 x^{3} \frac{1}{x} + 6 x \frac{1}{x} + \ln (x) (28 x^{3}) + \ln (x) (- 15 x^{2}) + \ln (x) \cdot 6$

Step 4.3

Combine terms.

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Step 4.3.1

Combine $7$ and $\frac{1}{x}$ .

$x^{4} \frac{7}{x} - 5 x^{3} \frac{1}{x} + 6 x \frac{1}{x} + \ln (x) (28 x^{3}) + \ln (x) (- 15 x^{2}) + \ln (x) \cdot 6$

Step 4.3.2

Combine $x^{4}$ and $\frac{7}{x}$ .

$\frac{x^{4} \cdot 7}{x} - 5 x^{3} \frac{1}{x} + 6 x \frac{1}{x} + \ln (x) (28 x^{3}) + \ln (x) (- 15 x^{2}) + \ln (x) \cdot 6$

Step 4.3.3

Move $7$ to the left of $x^{4}$ .

$\frac{7 \cdot x^{4}}{x} - 5 x^{3} \frac{1}{x} + 6 x \frac{1}{x} + \ln (x) (28 x^{3}) + \ln (x) (- 15 x^{2}) + \ln (x) \cdot 6$

Step 4.3.4

Cancel the common factor of $x^{4}$ and $x$ .

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Step 4.3.4.1

Factor $x$ out of $7 x^{4}$ .

$\frac{x (7 x^{3})}{x} - 5 x^{3} \frac{1}{x} + 6 x \frac{1}{x} + \ln (x) (28 x^{3}) + \ln (x) (- 15 x^{2}) + \ln (x) \cdot 6$

Step 4.3.4.2

Cancel the common factors.

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Step 4.3.4.2.1

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

$\frac{x (7 x^{3})}{x^{1}} - 5 x^{3} \frac{1}{x} + 6 x \frac{1}{x} + \ln (x) (28 x^{3}) + \ln (x) (- 15 x^{2}) + \ln (x) \cdot 6$

Step 4.3.4.2.2

Factor $x$ out of $x^{1}$ .

$\frac{x (7 x^{3})}{x \cdot 1} - 5 x^{3} \frac{1}{x} + 6 x \frac{1}{x} + \ln (x) (28 x^{3}) + \ln (x) (- 15 x^{2}) + \ln (x) \cdot 6$

Step 4.3.4.2.3

Cancel the common factor.

$\frac{x (7 x^{3})}{x \cdot 1} - 5 x^{3} \frac{1}{x} + 6 x \frac{1}{x} + \ln (x) (28 x^{3}) + \ln (x) (- 15 x^{2}) + \ln (x) \cdot 6$

Step 4.3.4.2.4

Rewrite the expression.

$\frac{7 x^{3}}{1} - 5 x^{3} \frac{1}{x} + 6 x \frac{1}{x} + \ln (x) (28 x^{3}) + \ln (x) (- 15 x^{2}) + \ln (x) \cdot 6$

Step 4.3.4.2.5

Divide $7 x^{3}$ by $1$ .

$7 x^{3} - 5 x^{3} \frac{1}{x} + 6 x \frac{1}{x} + \ln (x) (28 x^{3}) + \ln (x) (- 15 x^{2}) + \ln (x) \cdot 6$

Step 4.3.5

Combine $- 5$ and $\frac{1}{x}$ .

$7 x^{3} + x^{3} \frac{- 5}{x} + 6 x \frac{1}{x} + \ln (x) (28 x^{3}) + \ln (x) (- 15 x^{2}) + \ln (x) \cdot 6$

Step 4.3.6

Combine $x^{3}$ and $\frac{- 5}{x}$ .

$7 x^{3} + \frac{x^{3} \cdot - 5}{x} + 6 x \frac{1}{x} + \ln (x) (28 x^{3}) + \ln (x) (- 15 x^{2}) + \ln (x) \cdot 6$

Step 4.3.7

Move $- 5$ to the left of $x^{3}$ .

$7 x^{3} + \frac{- 5 \cdot x^{3}}{x} + 6 x \frac{1}{x} + \ln (x) (28 x^{3}) + \ln (x) (- 15 x^{2}) + \ln (x) \cdot 6$

Step 4.3.8

Cancel the common factor of $x^{3}$ and $x$ .

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Step 4.3.8.1

Factor $x$ out of $- 5 x^{3}$ .

$7 x^{3} + \frac{x (- 5 x^{2})}{x} + 6 x \frac{1}{x} + \ln (x) (28 x^{3}) + \ln (x) (- 15 x^{2}) + \ln (x) \cdot 6$

Step 4.3.8.2

Cancel the common factors.

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Step 4.3.8.2.1

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

$7 x^{3} + \frac{x (- 5 x^{2})}{x^{1}} + 6 x \frac{1}{x} + \ln (x) (28 x^{3}) + \ln (x) (- 15 x^{2}) + \ln (x) \cdot 6$

Step 4.3.8.2.2

Factor $x$ out of $x^{1}$ .

$7 x^{3} + \frac{x (- 5 x^{2})}{x \cdot 1} + 6 x \frac{1}{x} + \ln (x) (28 x^{3}) + \ln (x) (- 15 x^{2}) + \ln (x) \cdot 6$

Step 4.3.8.2.3

Cancel the common factor.

$7 x^{3} + \frac{x (- 5 x^{2})}{x \cdot 1} + 6 x \frac{1}{x} + \ln (x) (28 x^{3}) + \ln (x) (- 15 x^{2}) + \ln (x) \cdot 6$

Step 4.3.8.2.4

Rewrite the expression.

$7 x^{3} + \frac{- 5 x^{2}}{1} + 6 x \frac{1}{x} + \ln (x) (28 x^{3}) + \ln (x) (- 15 x^{2}) + \ln (x) \cdot 6$

Step 4.3.8.2.5

Divide $- 5 x^{2}$ by $1$ .

$7 x^{3} - 5 x^{2} + 6 x \frac{1}{x} + \ln (x) (28 x^{3}) + \ln (x) (- 15 x^{2}) + \ln (x) \cdot 6$

Step 4.3.9

Combine $6$ and $\frac{1}{x}$ .

$7 x^{3} - 5 x^{2} + x \frac{6}{x} + \ln (x) (28 x^{3}) + \ln (x) (- 15 x^{2}) + \ln (x) \cdot 6$

Step 4.3.10

Combine $x$ and $\frac{6}{x}$ .

$7 x^{3} - 5 x^{2} + \frac{x \cdot 6}{x} + \ln (x) (28 x^{3}) + \ln (x) (- 15 x^{2}) + \ln (x) \cdot 6$

Step 4.3.11

Move $6$ to the left of $x$ .

$7 x^{3} - 5 x^{2} + \frac{6 \cdot x}{x} + \ln (x) (28 x^{3}) + \ln (x) (- 15 x^{2}) + \ln (x) \cdot 6$

Step 4.3.12

Cancel the common factor of $x$ .

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Step 4.3.12.1

Cancel the common factor.

$7 x^{3} - 5 x^{2} + \frac{6 x}{x} + \ln (x) (28 x^{3}) + \ln (x) (- 15 x^{2}) + \ln (x) \cdot 6$

Step 4.3.12.2

Divide $6$ by $1$ .

$7 x^{3} - 5 x^{2} + 6 + \ln (x) (28 x^{3}) + \ln (x) (- 15 x^{2}) + \ln (x) \cdot 6$

Step 4.3.13

Move $6$ to the left of $\ln (x)$ .

$7 x^{3} - 5 x^{2} + 6 + \ln (x) (28 x^{3}) + \ln (x) (- 15 x^{2}) + 6 \ln (x)$

Step 4.4

Reorder terms.

$7 x^{3} - 5 x^{2} + 28 x^{3} \ln (x) - 15 x^{2} \ln (x) + 6 \ln (x) + 6$