Calculus Examples

$y = e^{7 x^{2}} + x$

Step 1

By the Sum Rule, the derivative of $e^{7 x^{2}} + x$ with respect to $x$ is $\frac{d}{d x} [e^{7 x^{2}}] + \frac{d}{d x} [x]$ .

$\frac{d}{d x} [e^{7 x^{2}}] + \frac{d}{d x} [x]$

Step 2

Evaluate $\frac{d}{d x} [e^{7 x^{2}}]$ .

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Step 2.1

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 $g (x) = 7 x^{2}$ .

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Step 2.1.1

To apply the Chain Rule, set $u$ as $7 x^{2}$ .

$\frac{d}{d u} [e^{u}] \frac{d}{d x} [7 x^{2}] + \frac{d}{d x} [x]$

Step 2.1.2

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

$e^{u} \frac{d}{d x} [7 x^{2}] + \frac{d}{d x} [x]$

Step 2.1.3

Replace all occurrences of $u$ with $7 x^{2}$ .

$e^{7 x^{2}} \frac{d}{d x} [7 x^{2}] + \frac{d}{d x} [x]$

Step 2.2

Since $7$ is constant with respect to $x$ , the derivative of $7 x^{2}$ with respect to $x$ is $7 \frac{d}{d x} [x^{2}]$ .

$e^{7 x^{2}} (7 \frac{d}{d x} [x^{2}]) + \frac{d}{d x} [x]$

Step 2.3

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

$e^{7 x^{2}} (7 (2 x)) + \frac{d}{d x} [x]$

Step 2.4

Multiply $2$ by $7$ .

$e^{7 x^{2}} (14 x) + \frac{d}{d x} [x]$

Step 3

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

$e^{7 x^{2}} (14 x) + 1$

Step 4

Simplify.

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Step 4.1

Reorder terms.

$14 e^{7 x^{2}} x + 1$

Step 4.2

Reorder factors in $14 e^{7 x^{2}} x + 1$ .

$14 x e^{7 x^{2}} + 1$