Calculus Examples

$y = x^{2} e^{x} - 2 x e^{x} + 8 e^{x}$

Step 1

By the Sum Rule, the derivative of $x^{2} e^{x} - 2 x e^{x} + 8 e^{x}$ with respect to $x$ is $\frac{d}{d x} [x^{2} e^{x}] + \frac{d}{d x} [- 2 x e^{x}] + \frac{d}{d x} [8 e^{x}]$ .

$\frac{d}{d x} [x^{2} e^{x}] + \frac{d}{d x} [- 2 x e^{x}] + \frac{d}{d x} [8 e^{x}]$

Step 2

Evaluate $\frac{d}{d x} [x^{2} e^{x}]$ .

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Step 2.1

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

$x^{2} \frac{d}{d x} [e^{x}] + e^{x} \frac{d}{d x} [x^{2}] + \frac{d}{d x} [- 2 x e^{x}] + \frac{d}{d x} [8 e^{x}]$

Step 2.2

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

$x^{2} e^{x} + e^{x} \frac{d}{d x} [x^{2}] + \frac{d}{d x} [- 2 x e^{x}] + \frac{d}{d x} [8 e^{x}]$

Step 2.3

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

$x^{2} e^{x} + e^{x} (2 x) + \frac{d}{d x} [- 2 x e^{x}] + \frac{d}{d x} [8 e^{x}]$

Step 3

Evaluate $\frac{d}{d x} [- 2 x e^{x}]$ .

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Step 3.1

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

$x^{2} e^{x} + e^{x} (2 x) - 2 \frac{d}{d x} [x e^{x}] + \frac{d}{d x} [8 e^{x}]$

Step 3.2

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 $g (x) = e^{x}$ .

$x^{2} e^{x} + e^{x} (2 x) - 2 (x \frac{d}{d x} [e^{x}] + e^{x} \frac{d}{d x} [x]) + \frac{d}{d x} [8 e^{x}]$

Step 3.3

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

$x^{2} e^{x} + e^{x} (2 x) - 2 (x e^{x} + e^{x} \frac{d}{d x} [x]) + \frac{d}{d x} [8 e^{x}]$

Step 3.4

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

$x^{2} e^{x} + e^{x} (2 x) - 2 (x e^{x} + e^{x} \cdot 1) + \frac{d}{d x} [8 e^{x}]$

Step 3.5

Multiply $e^{x}$ by $1$ .

$x^{2} e^{x} + e^{x} (2 x) - 2 (x e^{x} + e^{x}) + \frac{d}{d x} [8 e^{x}]$

Step 4

Evaluate $\frac{d}{d x} [8 e^{x}]$ .

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Step 4.1

Since $8$ is constant with respect to $x$ , the derivative of $8 e^{x}$ with respect to $x$ is $8 \frac{d}{d x} [e^{x}]$ .

$x^{2} e^{x} + e^{x} (2 x) - 2 (x e^{x} + e^{x}) + 8 \frac{d}{d x} [e^{x}]$

Step 4.2

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

$x^{2} e^{x} + e^{x} (2 x) - 2 (x e^{x} + e^{x}) + 8 e^{x}$

Step 5

Simplify.

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Step 5.1

Apply the distributive property.

$x^{2} e^{x} + e^{x} (2 x) - 2 (x e^{x}) - 2 e^{x} + 8 e^{x}$

Step 5.2

Combine terms.

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Step 5.2.1

Subtract $2 x e^{x}$ from $e^{x} (2 x)$ .

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Step 5.2.1.1

Move $e^{x}$ .

$x^{2} e^{x} + 2 x e^{x} - 2 x e^{x} - 2 e^{x} + 8 e^{x}$

Step 5.2.1.2

Subtract $2 x e^{x}$ from $2 x e^{x}$ .

$x^{2} e^{x} + 0 - 2 e^{x} + 8 e^{x}$

Step 5.2.2

Add $x^{2} e^{x}$ and $0$ .

$x^{2} e^{x} - 2 e^{x} + 8 e^{x}$

Step 5.2.3

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

$x^{2} e^{x} + 6 e^{x}$

Step 5.3

Reorder terms.

$e^{x} x^{2} + 6 e^{x}$

Step 5.4

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

$x^{2} e^{x} + 6 e^{x}$