Calculus Examples

$x (11 - 2 x) (19 - 2 x)$

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 $f (x) = x (11 - 2 x)$ and $g (x) = 19 - 2 x$ .

$x (11 - 2 x) \frac{d}{d x} [19 - 2 x] + (19 - 2 x) \frac{d}{d x} [x (11 - 2 x)]$

Step 2

Differentiate.

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Step 2.1

By the Sum Rule, the derivative of $19 - 2 x$ with respect to $x$ is $\frac{d}{d x} [19] + \frac{d}{d x} [- 2 x]$ .

$x (11 - 2 x) (\frac{d}{d x} [19] + \frac{d}{d x} [- 2 x]) + (19 - 2 x) \frac{d}{d x} [x (11 - 2 x)]$

Step 2.2

Since $19$ is constant with respect to $x$ , the derivative of $19$ with respect to $x$ is $0$ .

$x (11 - 2 x) (0 + \frac{d}{d x} [- 2 x]) + (19 - 2 x) \frac{d}{d x} [x (11 - 2 x)]$

Step 2.3

Add $0$ and $\frac{d}{d x} [- 2 x]$ .

$x (11 - 2 x) \frac{d}{d x} [- 2 x] + (19 - 2 x) \frac{d}{d x} [x (11 - 2 x)]$

Step 2.4

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

$x (11 - 2 x) (- 2 \frac{d}{d x} [x]) + (19 - 2 x) \frac{d}{d x} [x (11 - 2 x)]$

Step 2.5

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

$x (11 - 2 x) (- 2 \cdot 1) + (19 - 2 x) \frac{d}{d x} [x (11 - 2 x)]$

Step 2.6

Simplify the expression.

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Step 2.6.1

Multiply $- 2$ by $1$ .

$x (11 - 2 x) \cdot - 2 + (19 - 2 x) \frac{d}{d x} [x (11 - 2 x)]$

Step 2.6.2

Move $- 2$ to the left of $x (11 - 2 x)$ .

$- 2 \cdot (x (11 - 2 x)) + (19 - 2 x) \frac{d}{d x} [x (11 - 2 x)]$

Step 3

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 $g (x) = 11 - 2 x$ .

$- 2 x (11 - 2 x) + (19 - 2 x) (x \frac{d}{d x} [11 - 2 x] + (11 - 2 x) \frac{d}{d x} [x])$

Step 4

Differentiate.

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Step 4.1

By the Sum Rule, the derivative of $11 - 2 x$ with respect to $x$ is $\frac{d}{d x} [11] + \frac{d}{d x} [- 2 x]$ .

$- 2 x (11 - 2 x) + (19 - 2 x) (x (\frac{d}{d x} [11] + \frac{d}{d x} [- 2 x]) + (11 - 2 x) \frac{d}{d x} [x])$

Step 4.2

Since $11$ is constant with respect to $x$ , the derivative of $11$ with respect to $x$ is $0$ .

$- 2 x (11 - 2 x) + (19 - 2 x) (x (0 + \frac{d}{d x} [- 2 x]) + (11 - 2 x) \frac{d}{d x} [x])$

Step 4.3

Add $0$ and $\frac{d}{d x} [- 2 x]$ .

$- 2 x (11 - 2 x) + (19 - 2 x) (x \frac{d}{d x} [- 2 x] + (11 - 2 x) \frac{d}{d x} [x])$

Step 4.4

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

$- 2 x (11 - 2 x) + (19 - 2 x) (x (- 2 \frac{d}{d x} [x]) + (11 - 2 x) \frac{d}{d x} [x])$

Step 4.5

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

$- 2 x (11 - 2 x) + (19 - 2 x) (x (- 2 \cdot 1) + (11 - 2 x) \frac{d}{d x} [x])$

Step 4.6

Simplify the expression.

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Step 4.6.1

Multiply $- 2$ by $1$ .

$- 2 x (11 - 2 x) + (19 - 2 x) (x \cdot - 2 + (11 - 2 x) \frac{d}{d x} [x])$

Step 4.6.2

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

$- 2 x (11 - 2 x) + (19 - 2 x) (- 2 \cdot x + (11 - 2 x) \frac{d}{d x} [x])$

Step 4.7

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

$- 2 x (11 - 2 x) + (19 - 2 x) (- 2 x + (11 - 2 x) \cdot 1)$

Step 4.8

Simplify by adding terms.

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Step 4.8.1

Multiply $11 - 2 x$ by $1$ .

$- 2 x (11 - 2 x) + (19 - 2 x) (- 2 x + 11 - 2 x)$

Step 4.8.2

Subtract $2 x$ from $- 2 x$ .

$- 2 x (11 - 2 x) + (19 - 2 x) (- 4 x + 11)$

Step 5

Simplify.

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Step 5.1

Apply the distributive property.

$- 2 x \cdot 11 - 2 x (- 2 x) + (19 - 2 x) (- 4 x + 11)$

Step 5.2

Apply the distributive property.

$- 2 x \cdot 11 - 2 x (- 2 x) + (19 - 2 x) (- 4 x) + (19 - 2 x) \cdot 11$

Step 5.3

Apply the distributive property.

$- 2 x \cdot 11 - 2 x (- 2 x) + 19 (- 4 x) - 2 x (- 4 x) + (19 - 2 x) \cdot 11$

Step 5.4

Apply the distributive property.

$- 2 x \cdot 11 - 2 x (- 2 x) + 19 (- 4 x) - 2 x (- 4 x) + 19 \cdot 11 - 2 x \cdot 11$

Step 5.5

Combine terms.

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Step 5.5.1

Multiply $11$ by $- 2$ .

$- 22 x - 2 x (- 2 x) + 19 (- 4 x) - 2 x (- 4 x) + 19 \cdot 11 - 2 x \cdot 11$

Step 5.5.2

Multiply $- 2$ by $- 2$ .

$- 22 x + 4 x \cdot x + 19 (- 4 x) - 2 x (- 4 x) + 19 \cdot 11 - 2 x \cdot 11$

Step 5.5.3

Raise $x$ to the power of $1$ .

$- 22 x + 4 (x^{1} x) + 19 (- 4 x) - 2 x (- 4 x) + 19 \cdot 11 - 2 x \cdot 11$

Step 5.5.4

Raise $x$ to the power of $1$ .

$- 22 x + 4 (x^{1} x^{1}) + 19 (- 4 x) - 2 x (- 4 x) + 19 \cdot 11 - 2 x \cdot 11$

Step 5.5.5

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$- 22 x + 4 x^{1 + 1} + 19 (- 4 x) - 2 x (- 4 x) + 19 \cdot 11 - 2 x \cdot 11$

Step 5.5.6

Add $1$ and $1$ .

$- 22 x + 4 x^{2} + 19 (- 4 x) - 2 x (- 4 x) + 19 \cdot 11 - 2 x \cdot 11$

Step 5.5.7

Multiply $- 4$ by $19$ .

$- 22 x + 4 x^{2} - 76 x - 2 x (- 4 x) + 19 \cdot 11 - 2 x \cdot 11$

Step 5.5.8

Multiply $- 4$ by $- 2$ .

$- 22 x + 4 x^{2} - 76 x + 8 x \cdot x + 19 \cdot 11 - 2 x \cdot 11$

Step 5.5.9

Raise $x$ to the power of $1$ .

$- 22 x + 4 x^{2} - 76 x + 8 (x^{1} x) + 19 \cdot 11 - 2 x \cdot 11$

Step 5.5.10

Raise $x$ to the power of $1$ .

$- 22 x + 4 x^{2} - 76 x + 8 (x^{1} x^{1}) + 19 \cdot 11 - 2 x \cdot 11$

Step 5.5.11

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$- 22 x + 4 x^{2} - 76 x + 8 x^{1 + 1} + 19 \cdot 11 - 2 x \cdot 11$

Step 5.5.12

Add $1$ and $1$ .

$- 22 x + 4 x^{2} - 76 x + 8 x^{2} + 19 \cdot 11 - 2 x \cdot 11$

Step 5.5.13

Multiply $19$ by $11$ .

$- 22 x + 4 x^{2} - 76 x + 8 x^{2} + 209 - 2 x \cdot 11$

Step 5.5.14

Multiply $11$ by $- 2$ .

$- 22 x + 4 x^{2} - 76 x + 8 x^{2} + 209 - 22 x$

Step 5.5.15

Subtract $22 x$ from $- 76 x$ .

$- 22 x + 4 x^{2} - 98 x + 8 x^{2} + 209$

Step 5.5.16

Subtract $98 x$ from $- 22 x$ .

$4 x^{2} - 120 x + 8 x^{2} + 209$

Step 5.5.17

Add $4 x^{2}$ and $8 x^{2}$ .

$12 x^{2} - 120 x + 209$