Calculus Examples

$| x | \cdot 60 + | x - 10 | \cdot 50 + | 30 - 2 x | \cdot 60$

Step 1

By the Sum Rule, the derivative of $| x | \cdot 60 + | x - 10 | \cdot 50 + | 30 - 2 x | \cdot 60$ with respect to $x$ is $\frac{d}{d x} [| x | \cdot 60] + \frac{d}{d x} [| x - 10 | \cdot 50] + \frac{d}{d x} [| 30 - 2 x | \cdot 60]$ .

$\frac{d}{d x} [| x | \cdot 60] + \frac{d}{d x} [| x - 10 | \cdot 50] + \frac{d}{d x} [| 30 - 2 x | \cdot 60]$

Step 2

Evaluate $\frac{d}{d x} [| x | \cdot 60]$ .

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Step 2.1

Move $60$ to the left of $| x |$ .

$\frac{d}{d x} [60 \cdot | x |] + \frac{d}{d x} [| x - 10 | \cdot 50] + \frac{d}{d x} [| 30 - 2 x | \cdot 60]$

Step 2.2

Since $60$ is constant with respect to $x$ , the derivative of $60 | x |$ with respect to $x$ is $60 \frac{d}{d x} [| x |]$ .

$60 \frac{d}{d x} [| x |] + \frac{d}{d x} [| x - 10 | \cdot 50] + \frac{d}{d x} [| 30 - 2 x | \cdot 60]$

Step 2.3

The derivative of $| x |$ with respect to $x$ is $\frac{x}{| x |}$ .

$60 \frac{x}{| x |} + \frac{d}{d x} [| x - 10 | \cdot 50] + \frac{d}{d x} [| 30 - 2 x | \cdot 60]$

Step 2.4

Combine $60$ and $\frac{x}{| x |}$ .

$\frac{60 x}{| x |} + \frac{d}{d x} [| x - 10 | \cdot 50] + \frac{d}{d x} [| 30 - 2 x | \cdot 60]$

Step 3

Evaluate $\frac{d}{d x} [| x - 10 | \cdot 50]$ .

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Step 3.1

Move $50$ to the left of $| x - 10 |$ .

$\frac{60 x}{| x |} + \frac{d}{d x} [50 \cdot | x - 10 |] + \frac{d}{d x} [| 30 - 2 x | \cdot 60]$

Step 3.2

Since $50$ is constant with respect to $x$ , the derivative of $50 | x - 10 |$ with respect to $x$ is $50 \frac{d}{d x} [| x - 10 |]$ .

$\frac{60 x}{| x |} + 50 \frac{d}{d x} [| x - 10 |] + \frac{d}{d x} [| 30 - 2 x | \cdot 60]$

Step 3.3

Differentiate using the chain rule, which states that $\frac{d}{d x} [f (g (x))]$ is $f' (g (x)) g' (x)$ where $f (x) = | x |$ and $g (x) = x - 10$ .

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Step 3.3.1

To apply the Chain Rule, set $u_{1}$ as $x - 10$ .

$\frac{60 x}{| x |} + 50 (\frac{d}{d u_{1}} [| u_{1} |] \frac{d}{d x} [x - 10]) + \frac{d}{d x} [| 30 - 2 x | \cdot 60]$

Step 3.3.2

The derivative of $| u_{1} |$ with respect to $u_{1}$ is $\frac{u_{1}}{| u_{1} |}$ .

$\frac{60 x}{| x |} + 50 (\frac{u_{1}}{| u_{1} |} \frac{d}{d x} [x - 10]) + \frac{d}{d x} [| 30 - 2 x | \cdot 60]$

Step 3.3.3

Replace all occurrences of $u_{1}$ with $x - 10$ .

$\frac{60 x}{| x |} + 50 (\frac{x - 10}{| x - 10 |} \frac{d}{d x} [x - 10]) + \frac{d}{d x} [| 30 - 2 x | \cdot 60]$

Step 3.4

By the Sum Rule, the derivative of $x - 10$ with respect to $x$ is $\frac{d}{d x} [x] + \frac{d}{d x} [- 10]$ .

$\frac{60 x}{| x |} + 50 (\frac{x - 10}{| x - 10 |} (\frac{d}{d x} [x] + \frac{d}{d x} [- 10])) + \frac{d}{d x} [| 30 - 2 x | \cdot 60]$

Step 3.5

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

$\frac{60 x}{| x |} + 50 (\frac{x - 10}{| x - 10 |} (1 + \frac{d}{d x} [- 10])) + \frac{d}{d x} [| 30 - 2 x | \cdot 60]$

Step 3.6

Since $- 10$ is constant with respect to $x$ , the derivative of $- 10$ with respect to $x$ is $0$ .

$\frac{60 x}{| x |} + 50 (\frac{x - 10}{| x - 10 |} (1 + 0)) + \frac{d}{d x} [| 30 - 2 x | \cdot 60]$

Step 3.7

Add $1$ and $0$ .

$\frac{60 x}{| x |} + 50 (\frac{x - 10}{| x - 10 |} \cdot 1) + \frac{d}{d x} [| 30 - 2 x | \cdot 60]$

Step 3.8

Multiply $\frac{x - 10}{| x - 10 |}$ by $1$ .

$\frac{60 x}{| x |} + 50 \frac{x - 10}{| x - 10 |} + \frac{d}{d x} [| 30 - 2 x | \cdot 60]$

Step 3.9

Combine $50$ and $\frac{x - 10}{| x - 10 |}$ .

$\frac{60 x}{| x |} + \frac{50 (x - 10)}{| x - 10 |} + \frac{d}{d x} [| 30 - 2 x | \cdot 60]$

Step 4

Evaluate $\frac{d}{d x} [| 30 - 2 x | \cdot 60]$ .

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Step 4.1

Move $60$ to the left of $| 30 - 2 x |$ .

$\frac{60 x}{| x |} + \frac{50 (x - 10)}{| x - 10 |} + \frac{d}{d x} [60 \cdot | 30 - 2 x |]$

Step 4.2

Since $60$ is constant with respect to $x$ , the derivative of $60 | 30 - 2 x |$ with respect to $x$ is $60 \frac{d}{d x} [| 30 - 2 x |]$ .

$\frac{60 x}{| x |} + \frac{50 (x - 10)}{| x - 10 |} + 60 \frac{d}{d x} [| 30 - 2 x |]$

Step 4.3

Differentiate using the chain rule, which states that $\frac{d}{d x} [f (g (x))]$ is $f' (g (x)) g' (x)$ where $f (x) = | x |$ and $g (x) = 30 - 2 x$ .

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Step 4.3.1

To apply the Chain Rule, set $u_{2}$ as $30 - 2 x$ .

$\frac{60 x}{| x |} + \frac{50 (x - 10)}{| x - 10 |} + 60 (\frac{d}{d u_{2}} [| u_{2} |] \frac{d}{d x} [30 - 2 x])$

Step 4.3.2

The derivative of $| u_{2} |$ with respect to $u_{2}$ is $\frac{u_{2}}{| u_{2} |}$ .

$\frac{60 x}{| x |} + \frac{50 (x - 10)}{| x - 10 |} + 60 (\frac{u_{2}}{| u_{2} |} \frac{d}{d x} [30 - 2 x])$

Step 4.3.3

Replace all occurrences of $u_{2}$ with $30 - 2 x$ .

$\frac{60 x}{| x |} + \frac{50 (x - 10)}{| x - 10 |} + 60 (\frac{30 - 2 x}{| 30 - 2 x |} \frac{d}{d x} [30 - 2 x])$

Step 4.4

By the Sum Rule, the derivative of $30 - 2 x$ with respect to $x$ is $\frac{d}{d x} [30] + \frac{d}{d x} [- 2 x]$ .

$\frac{60 x}{| x |} + \frac{50 (x - 10)}{| x - 10 |} + 60 (\frac{30 - 2 x}{| 30 - 2 x |} (\frac{d}{d x} [30] + \frac{d}{d x} [- 2 x]))$

Step 4.5

Since $30$ is constant with respect to $x$ , the derivative of $30$ with respect to $x$ is $0$ .

$\frac{60 x}{| x |} + \frac{50 (x - 10)}{| x - 10 |} + 60 (\frac{30 - 2 x}{| 30 - 2 x |} (0 + \frac{d}{d x} [- 2 x]))$

Step 4.6

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

$\frac{60 x}{| x |} + \frac{50 (x - 10)}{| x - 10 |} + 60 (\frac{30 - 2 x}{| 30 - 2 x |} (0 - 2 \frac{d}{d x} [x]))$

Step 4.7

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

$\frac{60 x}{| x |} + \frac{50 (x - 10)}{| x - 10 |} + 60 (\frac{30 - 2 x}{| 30 - 2 x |} (0 - 2 \cdot 1))$

Step 4.8

Multiply $- 2$ by $1$ .

$\frac{60 x}{| x |} + \frac{50 (x - 10)}{| x - 10 |} + 60 (\frac{30 - 2 x}{| 30 - 2 x |} (0 - 2))$

Step 4.9

Subtract $2$ from $0$ .

$\frac{60 x}{| x |} + \frac{50 (x - 10)}{| x - 10 |} + 60 (\frac{30 - 2 x}{| 30 - 2 x |} \cdot - 2)$

Step 4.10

Combine $\frac{30 - 2 x}{| 30 - 2 x |}$ and $- 2$ .

$\frac{60 x}{| x |} + \frac{50 (x - 10)}{| x - 10 |} + 60 \frac{(30 - 2 x) \cdot - 2}{| 30 - 2 x |}$

Step 4.11

Move $- 2$ to the left of $30 - 2 x$ .

$\frac{60 x}{| x |} + \frac{50 (x - 10)}{| x - 10 |} + 60 \frac{- 2 \cdot (30 - 2 x)}{| 30 - 2 x |}$

Step 4.12

Move the negative in front of the fraction.

$\frac{60 x}{| x |} + \frac{50 (x - 10)}{| x - 10 |} + 60 (- \frac{2 (30 - 2 x)}{| 30 - 2 x |})$

Step 4.13

Multiply $- 1$ by $60$ .

$\frac{60 x}{| x |} + \frac{50 (x - 10)}{| x - 10 |} - 60 \frac{2 (30 - 2 x)}{| 30 - 2 x |}$

Step 4.14

Combine $- 60$ and $\frac{2 (30 - 2 x)}{| 30 - 2 x |}$ .

$\frac{60 x}{| x |} + \frac{50 (x - 10)}{| x - 10 |} + \frac{- 60 (2 (30 - 2 x))}{| 30 - 2 x |}$

Step 4.15

Multiply $2$ by $- 60$ .

$\frac{60 x}{| x |} + \frac{50 (x - 10)}{| x - 10 |} + \frac{- 120 (30 - 2 x)}{| 30 - 2 x |}$

Step 4.16

Move the negative in front of the fraction.

$\frac{60 x}{| x |} + \frac{50 (x - 10)}{| x - 10 |} - \frac{120 (30 - 2 x)}{| 30 - 2 x |}$

Step 5

Simplify.

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Step 5.1

Apply the distributive property.

$\frac{60 x}{| x |} + \frac{50 x + 50 \cdot - 10}{| x - 10 |} - \frac{120 (30 - 2 x)}{| 30 - 2 x |}$

Step 5.2

Apply the distributive property.

$\frac{60 x}{| x |} + \frac{50 x + 50 \cdot - 10}{| x - 10 |} - \frac{120 \cdot 30 + 120 (- 2 x)}{| 30 - 2 x |}$

Step 5.3

Combine terms.

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Step 5.3.1

Multiply $50$ by $- 10$ .

$\frac{60 x}{| x |} + \frac{50 x - 500}{| x - 10 |} - \frac{120 \cdot 30 + 120 (- 2 x)}{| 30 - 2 x |}$

Step 5.3.2

Multiply $120$ by $30$ .

$\frac{60 x}{| x |} + \frac{50 x - 500}{| x - 10 |} - \frac{3600 + 120 (- 2 x)}{| 30 - 2 x |}$

Step 5.3.3

Multiply $- 2$ by $120$ .

$\frac{60 x}{| x |} + \frac{50 x - 500}{| x - 10 |} - \frac{3600 - 240 x}{| 30 - 2 x |}$