Calculus Examples

$f (x) = e^{x} (3 x^{2} - 2 x^{3})$

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 $f (x) = e^{x}$ and $g (x) = 3 x^{2} - 2 x^{3}$ .

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

Step 2

Differentiate.

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Step 2.1

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

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

Step 2.2

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

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

Step 2.3

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

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

Step 2.4

Multiply $2$ by $3$ .

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

Step 2.5

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

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

Step 2.6

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

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

Step 2.7

Multiply $3$ by $- 2$ .

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

Step 3

Differentiate using the Exponential Rule which states that $\frac{d}{d x} [a^{x}]$ is $a^{x} \ln (a)$ where $a$ = $e$ .

$e^{x} (6 x - 6 x^{2}) + (3 x^{2} - 2 x^{3}) e^{x}$

Step 4

Simplify.

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Step 4.1

Apply the distributive property.

$e^{x} (6 x) + e^{x} (- 6 x^{2}) + (3 x^{2} - 2 x^{3}) e^{x}$

Step 4.2

Apply the distributive property.

$e^{x} (6 x) + e^{x} (- 6 x^{2}) + 3 x^{2} e^{x} - 2 x^{3} e^{x}$

Step 4.3

Add $e^{x} (- 6 x^{2})$ and $3 x^{2} e^{x}$ .

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Step 4.3.1

Move $e^{x}$ .

$e^{x} (6 x) - 6 x^{2} e^{x} + 3 x^{2} e^{x} - 2 x^{3} e^{x}$

Step 4.3.2

Add $- 6 x^{2} e^{x}$ and $3 x^{2} e^{x}$ .

$e^{x} (6 x) - 3 x^{2} e^{x} - 2 x^{3} e^{x}$

Step 4.4

Reorder terms.

$6 e^{x} x - 3 e^{x} x^{2} - 2 e^{x} x^{3}$

Step 4.5

Reorder factors in $6 e^{x} x - 3 e^{x} x^{2} - 2 e^{x} x^{3}$ .

$6 x e^{x} - 3 x^{2} e^{x} - 2 x^{3} e^{x}$