Calculus Examples

$x^{7} {(x - 12)}^{5}$

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 $f (x) = x^{7}$ and $g (x) = {(x - 12)}^{5}$ .

$x^{7} \frac{d}{d x} [{(x - 12)}^{5}] + {(x - 12)}^{5} \frac{d}{d x} [x^{7}]$

Step 2

Differentiate using the chain rule, which states that $\frac{d}{d x} [f (g (x))]$ is $f' (g (x)) g' (x)$ where $f (x) = x^{5}$ and $g (x) = x - 12$ .

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Step 2.1

To apply the Chain Rule, set $u$ as $x - 12$ .

$x^{7} (\frac{d}{d u} [u^{5}] \frac{d}{d x} [x - 12]) + {(x - 12)}^{5} \frac{d}{d x} [x^{7}]$

Step 2.2

Differentiate using the Power Rule which states that $\frac{d}{d u} [u^{n}]$ is $n u^{n - 1}$ where $n = 5$ .

$x^{7} (5 u^{4} \frac{d}{d x} [x - 12]) + {(x - 12)}^{5} \frac{d}{d x} [x^{7}]$

Step 2.3

Replace all occurrences of $u$ with $x - 12$ .

$x^{7} (5 {(x - 12)}^{4} \frac{d}{d x} [x - 12]) + {(x - 12)}^{5} \frac{d}{d x} [x^{7}]$

Step 3

Differentiate.

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Step 3.1

By the Sum Rule, the derivative of $x - 12$ with respect to $x$ is $\frac{d}{d x} [x] + \frac{d}{d x} [- 12]$ .

$x^{7} (5 {(x - 12)}^{4} (\frac{d}{d x} [x] + \frac{d}{d x} [- 12])) + {(x - 12)}^{5} \frac{d}{d x} [x^{7}]$

Step 3.2

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

$x^{7} (5 {(x - 12)}^{4} (1 + \frac{d}{d x} [- 12])) + {(x - 12)}^{5} \frac{d}{d x} [x^{7}]$

Step 3.3

Since $- 12$ is constant with respect to $x$ , the derivative of $- 12$ with respect to $x$ is $0$ .

$x^{7} (5 {(x - 12)}^{4} (1 + 0)) + {(x - 12)}^{5} \frac{d}{d x} [x^{7}]$

Step 3.4

Simplify the expression.

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Step 3.4.1

Add $1$ and $0$ .

$x^{7} (5 {(x - 12)}^{4} \cdot 1) + {(x - 12)}^{5} \frac{d}{d x} [x^{7}]$

Step 3.4.2

Multiply $5$ by $1$ .

$x^{7} (5 {(x - 12)}^{4}) + {(x - 12)}^{5} \frac{d}{d x} [x^{7}]$

Step 3.5

Differentiate using the Power Rule which states that $\frac{d}{d x} [x^{n}]$ is $n x^{n - 1}$ where $n = 7$ .

$x^{7} (5 {(x - 12)}^{4}) + {(x - 12)}^{5} (7 x^{6})$

Step 4

Simplify.

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Step 4.1

Move $7$ to the left of ${(x - 12)}^{5}$ .

$x^{7} (5 {(x - 12)}^{4}) + 7 \cdot {(x - 12)}^{5} x^{6}$

Step 4.2

Factor $x^{6} {(x - 12)}^{4}$ out of $x^{7} (5 {(x - 12)}^{4}) + 7 {(x - 12)}^{5} x^{6}$ .

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Step 4.2.1

Factor $x^{6} {(x - 12)}^{4}$ out of $x^{7} (5 {(x - 12)}^{4})$ .

$x^{6} {(x - 12)}^{4} (x \cdot (5)) + 7 {(x - 12)}^{5} x^{6}$

Step 4.2.2

Factor $x^{6} {(x - 12)}^{4}$ out of $7 {(x - 12)}^{5} x^{6}$ .

$x^{6} {(x - 12)}^{4} (x \cdot (5)) + x^{6} {(x - 12)}^{4} (7 (x - 12))$

Step 4.2.3

Factor $x^{6} {(x - 12)}^{4}$ out of $x^{6} {(x - 12)}^{4} (x \cdot (5)) + x^{6} {(x - 12)}^{4} (7 (x - 12))$ .

$x^{6} {(x - 12)}^{4} (x \cdot (5) + 7 (x - 12))$

Step 4.3

Move $5$ to the left of $x$ .

$x^{6} {(x - 12)}^{4} (5 x + 7 (x - 12))$