Calculus Examples

$y = x^{3} \ln (x)$

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 $f (x) = x^{3}$ and $g (x) = \ln (x)$ .

$x^{3} \frac{d}{d x} [\ln (x)] + \ln (x) \frac{d}{d x} [x^{3}]$

Step 2

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

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

Step 3

Differentiate using the Power Rule.

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Step 3.1

Combine $x^{3}$ and $\frac{1}{x}$ .

$\frac{x^{3}}{x} + \ln (x) \frac{d}{d x} [x^{3}]$

Step 3.2

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

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Step 3.2.1

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

$\frac{x \cdot x^{2}}{x} + \ln (x) \frac{d}{d x} [x^{3}]$

Step 3.2.2

Cancel the common factors.

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Step 3.2.2.1

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

$\frac{x \cdot x^{2}}{x^{1}} + \ln (x) \frac{d}{d x} [x^{3}]$

Step 3.2.2.2

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

$\frac{x \cdot x^{2}}{x \cdot 1} + \ln (x) \frac{d}{d x} [x^{3}]$

Step 3.2.2.3

Cancel the common factor.

$\frac{x \cdot x^{2}}{x \cdot 1} + \ln (x) \frac{d}{d x} [x^{3}]$

Step 3.2.2.4

Rewrite the expression.

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

Step 3.2.2.5

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

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

Step 3.3

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

$x^{2} + \ln (x) (3 x^{2})$

Step 3.4

Reorder terms.

$x^{2} + 3 x^{2} \ln (x)$