Calculus Examples

$y = 5 x e^{5 x} - e^{5 x}$

Step 1

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

$\frac{d}{d x} [5 x e^{5 x}] + \frac{d}{d x} [- e^{5 x}]$

Step 2

Evaluate $\frac{d}{d x} [5 x e^{5 x}]$ .

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Step 2.1

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

$5 \frac{d}{d x} [x e^{5 x}] + \frac{d}{d x} [- e^{5 x}]$

Step 2.2

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 $g (x) = e^{5 x}$ .

$5 (x \frac{d}{d x} [e^{5 x}] + e^{5 x} \frac{d}{d x} [x]) + \frac{d}{d x} [- e^{5 x}]$

Step 2.3

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

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Step 2.3.1

To apply the Chain Rule, set $u_{1}$ as $5 x$ .

$5 (x (\frac{d}{d u_{1}} [e^{u_{1}}] \frac{d}{d x} [5 x]) + e^{5 x} \frac{d}{d x} [x]) + \frac{d}{d x} [- e^{5 x}]$

Step 2.3.2

Differentiate using the Exponential Rule which states that $\frac{d}{d u_{1}} [a^{u_{1}}]$ is $a^{u_{1}} \ln (a)$ where $a$ = $e$ .

$5 (x (e^{u_{1}} \frac{d}{d x} [5 x]) + e^{5 x} \frac{d}{d x} [x]) + \frac{d}{d x} [- e^{5 x}]$

Step 2.3.3

Replace all occurrences of $u_{1}$ with $5 x$ .

$5 (x (e^{5 x} \frac{d}{d x} [5 x]) + e^{5 x} \frac{d}{d x} [x]) + \frac{d}{d x} [- e^{5 x}]$

Step 2.4

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

$5 (x (e^{5 x} (5 \frac{d}{d x} [x])) + e^{5 x} \frac{d}{d x} [x]) + \frac{d}{d x} [- e^{5 x}]$

Step 2.5

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

$5 (x (e^{5 x} (5 \cdot 1)) + e^{5 x} \frac{d}{d x} [x]) + \frac{d}{d x} [- e^{5 x}]$

Step 2.6

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

$5 (x (e^{5 x} (5 \cdot 1)) + e^{5 x} \cdot 1) + \frac{d}{d x} [- e^{5 x}]$

Step 2.7

Multiply $5$ by $1$ .

$5 (x (e^{5 x} \cdot 5) + e^{5 x} \cdot 1) + \frac{d}{d x} [- e^{5 x}]$

Step 2.8

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

$5 (x (5 \cdot e^{5 x}) + e^{5 x} \cdot 1) + \frac{d}{d x} [- e^{5 x}]$

Step 2.9

Multiply $e^{5 x}$ by $1$ .

$5 (x (5 e^{5 x}) + e^{5 x}) + \frac{d}{d x} [- e^{5 x}]$

Step 3

Evaluate $\frac{d}{d x} [- e^{5 x}]$ .

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Step 3.1

Since $- 1$ is constant with respect to $x$ , the derivative of $- e^{5 x}$ with respect to $x$ is $- \frac{d}{d x} [e^{5 x}]$ .

$5 (x (5 e^{5 x}) + e^{5 x}) - \frac{d}{d x} [e^{5 x}]$

Step 3.2

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

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Step 3.2.1

To apply the Chain Rule, set $u_{2}$ as $5 x$ .

$5 (x (5 e^{5 x}) + e^{5 x}) - (\frac{d}{d u_{2}} [e^{u_{2}}] \frac{d}{d x} [5 x])$

Step 3.2.2

Differentiate using the Exponential Rule which states that $\frac{d}{d u_{2}} [a^{u_{2}}]$ is $a^{u_{2}} \ln (a)$ where $a$ = $e$ .

$5 (x (5 e^{5 x}) + e^{5 x}) - (e^{u_{2}} \frac{d}{d x} [5 x])$

Step 3.2.3

Replace all occurrences of $u_{2}$ with $5 x$ .

$5 (x (5 e^{5 x}) + e^{5 x}) - (e^{5 x} \frac{d}{d x} [5 x])$

Step 3.3

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

$5 (x (5 e^{5 x}) + e^{5 x}) - (e^{5 x} (5 \frac{d}{d x} [x]))$

Step 3.4

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

$5 (x (5 e^{5 x}) + e^{5 x}) - (e^{5 x} (5 \cdot 1))$

Step 3.5

Multiply $5$ by $1$ .

$5 (x (5 e^{5 x}) + e^{5 x}) - (e^{5 x} \cdot 5)$

Step 3.6

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

$5 (x (5 e^{5 x}) + e^{5 x}) - (5 \cdot e^{5 x})$

Step 3.7

Multiply $5$ by $- 1$ .

$5 (x (5 e^{5 x}) + e^{5 x}) - 5 e^{5 x}$

Step 4

Simplify.

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Step 4.1

Apply the distributive property.

$5 (x (5 e^{5 x})) + 5 e^{5 x} - 5 e^{5 x}$

Step 4.2

Combine terms.

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Step 4.2.1

Multiply $5$ by $5$ .

$25 (x (e^{5 x})) + 5 e^{5 x} - 5 e^{5 x}$

Step 4.2.2

Subtract $5 e^{5 x}$ from $5 e^{5 x}$ .

$25 x e^{5 x} + 0$

Step 4.2.3

Add $25 x e^{5 x}$ and $0$ .

$25 x e^{5 x}$

Step 4.3

Reorder the factors of $25 x e^{5 x}$ .

$25 e^{5 x} x$

Step 4.4

Reorder factors in $25 e^{5 x} x$ .

$25 x e^{5 x}$