Calculus Examples

$f (x) = \frac{(x + 5) (x^{2} + 5)}{x - 8}$

Step 1

Differentiate using the Quotient Rule which states that $\frac{d}{d x} [\frac{f (x)}{g (x)}]$ is $\frac{g (x) \frac{d}{d x} [f (x)] - f (x) \frac{d}{d x} [g (x)]}{{g (x)}^{2}}$ where $f (x) = (x + 5) (x^{2} + 5)$ and $g (x) = x - 8$ .

$\frac{(x - 8) \frac{d}{d x} [(x + 5) (x^{2} + 5)] - (x + 5) (x^{2} + 5) \frac{d}{d x} [x - 8]}{{(x - 8)}^{2}}$

Step 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 $f (x) = x + 5$ and $g (x) = x^{2} + 5$ .

$\frac{(x - 8) ((x + 5) \frac{d}{d x} [x^{2} + 5] + (x^{2} + 5) \frac{d}{d x} [x + 5]) - (x + 5) (x^{2} + 5) \frac{d}{d x} [x - 8]}{{(x - 8)}^{2}}$

Step 3

Differentiate.

Tap for more steps...

Step 3.1

By the Sum Rule, the derivative of $x^{2} + 5$ with respect to $x$ is $\frac{d}{d x} [x^{2}] + \frac{d}{d x} [5]$ .

$\frac{(x - 8) ((x + 5) (\frac{d}{d x} [x^{2}] + \frac{d}{d x} [5]) + (x^{2} + 5) \frac{d}{d x} [x + 5]) - (x + 5) (x^{2} + 5) \frac{d}{d x} [x - 8]}{{(x - 8)}^{2}}$

Step 3.2

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

$\frac{(x - 8) ((x + 5) (2 x + \frac{d}{d x} [5]) + (x^{2} + 5) \frac{d}{d x} [x + 5]) - (x + 5) (x^{2} + 5) \frac{d}{d x} [x - 8]}{{(x - 8)}^{2}}$

Step 3.3

Since $5$ is constant with respect to $x$ , the derivative of $5$ with respect to $x$ is $0$ .

$\frac{(x - 8) ((x + 5) (2 x + 0) + (x^{2} + 5) \frac{d}{d x} [x + 5]) - (x + 5) (x^{2} + 5) \frac{d}{d x} [x - 8]}{{(x - 8)}^{2}}$

Step 3.4

Simplify the expression.

Tap for more steps...

Step 3.4.1

Add $2 x$ and $0$ .

$\frac{(x - 8) ((x + 5) (2 x) + (x^{2} + 5) \frac{d}{d x} [x + 5]) - (x + 5) (x^{2} + 5) \frac{d}{d x} [x - 8]}{{(x - 8)}^{2}}$

Step 3.4.2

Move $2$ to the left of $x + 5$ .

$\frac{(x - 8) (2 \cdot (x + 5) x + (x^{2} + 5) \frac{d}{d x} [x + 5]) - (x + 5) (x^{2} + 5) \frac{d}{d x} [x - 8]}{{(x - 8)}^{2}}$

Step 3.5

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

$\frac{(x - 8) (2 (x + 5) x + (x^{2} + 5) (\frac{d}{d x} [x] + \frac{d}{d x} [5])) - (x + 5) (x^{2} + 5) \frac{d}{d x} [x - 8]}{{(x - 8)}^{2}}$

Step 3.6

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

$\frac{(x - 8) (2 (x + 5) x + (x^{2} + 5) (1 + \frac{d}{d x} [5])) - (x + 5) (x^{2} + 5) \frac{d}{d x} [x - 8]}{{(x - 8)}^{2}}$

Step 3.7

Since $5$ is constant with respect to $x$ , the derivative of $5$ with respect to $x$ is $0$ .

$\frac{(x - 8) (2 (x + 5) x + (x^{2} + 5) (1 + 0)) - (x + 5) (x^{2} + 5) \frac{d}{d x} [x - 8]}{{(x - 8)}^{2}}$

Step 3.8

Simplify the expression.

Tap for more steps...

Step 3.8.1

Add $1$ and $0$ .

$\frac{(x - 8) (2 (x + 5) x + (x^{2} + 5) \cdot 1) - (x + 5) (x^{2} + 5) \frac{d}{d x} [x - 8]}{{(x - 8)}^{2}}$

Step 3.8.2

Multiply $x^{2} + 5$ by $1$ .

$\frac{(x - 8) (2 (x + 5) x + x^{2} + 5) - (x + 5) (x^{2} + 5) \frac{d}{d x} [x - 8]}{{(x - 8)}^{2}}$

Step 3.9

By the Sum Rule, the derivative of $x - 8$ with respect to $x$ is $\frac{d}{d x} [x] + \frac{d}{d x} [- 8]$ .

$\frac{(x - 8) (2 (x + 5) x + x^{2} + 5) - (x + 5) (x^{2} + 5) (\frac{d}{d x} [x] + \frac{d}{d x} [- 8])}{{(x - 8)}^{2}}$

Step 3.10

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

$\frac{(x - 8) (2 (x + 5) x + x^{2} + 5) - (x + 5) (x^{2} + 5) (1 + \frac{d}{d x} [- 8])}{{(x - 8)}^{2}}$

Step 3.11

Since $- 8$ is constant with respect to $x$ , the derivative of $- 8$ with respect to $x$ is $0$ .

$\frac{(x - 8) (2 (x + 5) x + x^{2} + 5) - (x + 5) (x^{2} + 5) (1 + 0)}{{(x - 8)}^{2}}$

Step 3.12

Simplify the expression.

Tap for more steps...

Step 3.12.1

Add $1$ and $0$ .

$\frac{(x - 8) (2 (x + 5) x + x^{2} + 5) - (x + 5) (x^{2} + 5) \cdot 1}{{(x - 8)}^{2}}$

Step 3.12.2

Multiply $- 1$ by $1$ .

$\frac{(x - 8) (2 (x + 5) x + x^{2} + 5) - (x + 5) (x^{2} + 5)}{{(x - 8)}^{2}}$

Step 4

Simplify.

Tap for more steps...

Step 4.1

Apply the distributive property.

$\frac{(x - 8) ((2 x + 2 \cdot 5) x + x^{2} + 5) - (x + 5) (x^{2} + 5)}{{(x - 8)}^{2}}$

Step 4.2

Apply the distributive property.

$\frac{(x - 8) (2 x \cdot x + 2 \cdot 5 x + x^{2} + 5) - (x + 5) (x^{2} + 5)}{{(x - 8)}^{2}}$

Step 4.3

Apply the distributive property.

$\frac{(x - 8) (2 x \cdot x + 2 \cdot 5 x + x^{2} + 5) + (- x - 1 \cdot 5) (x^{2} + 5)}{{(x - 8)}^{2}}$

Step 4.4

Simplify the numerator.

Tap for more steps...

Step 4.4.1

Simplify each term.

Tap for more steps...

Step 4.4.1.1

Simplify each term.

Tap for more steps...

Step 4.4.1.1.1

Multiply $x$ by $x$ by adding the exponents.

Tap for more steps...

Step 4.4.1.1.1.1

Move $x$ .

$\frac{(x - 8) (2 (x \cdot x) + 2 \cdot 5 x + x^{2} + 5) + (- x - 1 \cdot 5) (x^{2} + 5)}{{(x - 8)}^{2}}$

Step 4.4.1.1.1.2

Multiply $x$ by $x$ .

$\frac{(x - 8) (2 x^{2} + 2 \cdot 5 x + x^{2} + 5) + (- x - 1 \cdot 5) (x^{2} + 5)}{{(x - 8)}^{2}}$

Step 4.4.1.1.2

Multiply $2$ by $5$ .

$\frac{(x - 8) (2 x^{2} + 10 x + x^{2} + 5) + (- x - 1 \cdot 5) (x^{2} + 5)}{{(x - 8)}^{2}}$

Step 4.4.1.2

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

$\frac{(x - 8) (3 x^{2} + 10 x + 5) + (- x - 1 \cdot 5) (x^{2} + 5)}{{(x - 8)}^{2}}$

Step 4.4.1.3

Expand $(x - 8) (3 x^{2} + 10 x + 5)$ by multiplying each term in the first expression by each term in the second expression.

$\frac{x (3 x^{2}) + x (10 x) + x \cdot 5 - 8 (3 x^{2}) - 8 (10 x) - 8 \cdot 5 + (- x - 1 \cdot 5) (x^{2} + 5)}{{(x - 8)}^{2}}$

Step 4.4.1.4

Simplify each term.

Tap for more steps...

Step 4.4.1.4.1

Rewrite using the commutative property of multiplication.

$\frac{3 x \cdot x^{2} + x (10 x) + x \cdot 5 - 8 (3 x^{2}) - 8 (10 x) - 8 \cdot 5 + (- x - 1 \cdot 5) (x^{2} + 5)}{{(x - 8)}^{2}}$

Step 4.4.1.4.2

Multiply $x$ by $x^{2}$ by adding the exponents.

Tap for more steps...

Step 4.4.1.4.2.1

Move $x^{2}$ .

$\frac{3 (x^{2} x) + x (10 x) + x \cdot 5 - 8 (3 x^{2}) - 8 (10 x) - 8 \cdot 5 + (- x - 1 \cdot 5) (x^{2} + 5)}{{(x - 8)}^{2}}$

Step 4.4.1.4.2.2

Multiply $x^{2}$ by $x$ .

Tap for more steps...

Step 4.4.1.4.2.2.1

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

$\frac{3 (x^{2} x^{1}) + x (10 x) + x \cdot 5 - 8 (3 x^{2}) - 8 (10 x) - 8 \cdot 5 + (- x - 1 \cdot 5) (x^{2} + 5)}{{(x - 8)}^{2}}$

Step 4.4.1.4.2.2.2

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

$\frac{3 x^{2 + 1} + x (10 x) + x \cdot 5 - 8 (3 x^{2}) - 8 (10 x) - 8 \cdot 5 + (- x - 1 \cdot 5) (x^{2} + 5)}{{(x - 8)}^{2}}$

Step 4.4.1.4.2.3

Add $2$ and $1$ .

$\frac{3 x^{3} + x (10 x) + x \cdot 5 - 8 (3 x^{2}) - 8 (10 x) - 8 \cdot 5 + (- x - 1 \cdot 5) (x^{2} + 5)}{{(x - 8)}^{2}}$

Step 4.4.1.4.3

Rewrite using the commutative property of multiplication.

$\frac{3 x^{3} + 10 x \cdot x + x \cdot 5 - 8 (3 x^{2}) - 8 (10 x) - 8 \cdot 5 + (- x - 1 \cdot 5) (x^{2} + 5)}{{(x - 8)}^{2}}$

Step 4.4.1.4.4

Multiply $x$ by $x$ by adding the exponents.

Tap for more steps...

Step 4.4.1.4.4.1

Move $x$ .

$\frac{3 x^{3} + 10 (x \cdot x) + x \cdot 5 - 8 (3 x^{2}) - 8 (10 x) - 8 \cdot 5 + (- x - 1 \cdot 5) (x^{2} + 5)}{{(x - 8)}^{2}}$

Step 4.4.1.4.4.2

Multiply $x$ by $x$ .

$\frac{3 x^{3} + 10 x^{2} + x \cdot 5 - 8 (3 x^{2}) - 8 (10 x) - 8 \cdot 5 + (- x - 1 \cdot 5) (x^{2} + 5)}{{(x - 8)}^{2}}$

Step 4.4.1.4.5

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

$\frac{3 x^{3} + 10 x^{2} + 5 \cdot x - 8 (3 x^{2}) - 8 (10 x) - 8 \cdot 5 + (- x - 1 \cdot 5) (x^{2} + 5)}{{(x - 8)}^{2}}$

Step 4.4.1.4.6

Multiply $3$ by $- 8$ .

$\frac{3 x^{3} + 10 x^{2} + 5 x - 24 x^{2} - 8 (10 x) - 8 \cdot 5 + (- x - 1 \cdot 5) (x^{2} + 5)}{{(x - 8)}^{2}}$

Step 4.4.1.4.7

Multiply $10$ by $- 8$ .

$\frac{3 x^{3} + 10 x^{2} + 5 x - 24 x^{2} - 80 x - 8 \cdot 5 + (- x - 1 \cdot 5) (x^{2} + 5)}{{(x - 8)}^{2}}$

Step 4.4.1.4.8

Multiply $- 8$ by $5$ .

$\frac{3 x^{3} + 10 x^{2} + 5 x - 24 x^{2} - 80 x - 40 + (- x - 1 \cdot 5) (x^{2} + 5)}{{(x - 8)}^{2}}$

Step 4.4.1.5

Subtract $24 x^{2}$ from $10 x^{2}$ .

$\frac{3 x^{3} - 14 x^{2} + 5 x - 80 x - 40 + (- x - 1 \cdot 5) (x^{2} + 5)}{{(x - 8)}^{2}}$

Step 4.4.1.6

Subtract $80 x$ from $5 x$ .

$\frac{3 x^{3} - 14 x^{2} - 75 x - 40 + (- x - 1 \cdot 5) (x^{2} + 5)}{{(x - 8)}^{2}}$

Step 4.4.1.7

Multiply $- 1$ by $5$ .

$\frac{3 x^{3} - 14 x^{2} - 75 x - 40 + (- x - 5) (x^{2} + 5)}{{(x - 8)}^{2}}$

Step 4.4.1.8

Expand $(- x - 5) (x^{2} + 5)$ using the FOIL Method.

Tap for more steps...

Step 4.4.1.8.1

Apply the distributive property.

$\frac{3 x^{3} - 14 x^{2} - 75 x - 40 - x (x^{2} + 5) - 5 (x^{2} + 5)}{{(x - 8)}^{2}}$

Step 4.4.1.8.2

Apply the distributive property.

$\frac{3 x^{3} - 14 x^{2} - 75 x - 40 - x \cdot x^{2} - x \cdot 5 - 5 (x^{2} + 5)}{{(x - 8)}^{2}}$

Step 4.4.1.8.3

Apply the distributive property.

$\frac{3 x^{3} - 14 x^{2} - 75 x - 40 - x \cdot x^{2} - x \cdot 5 - 5 x^{2} - 5 \cdot 5}{{(x - 8)}^{2}}$

Step 4.4.1.9

Simplify each term.

Tap for more steps...

Step 4.4.1.9.1

Multiply $x$ by $x^{2}$ by adding the exponents.

Tap for more steps...

Step 4.4.1.9.1.1

Move $x^{2}$ .

$\frac{3 x^{3} - 14 x^{2} - 75 x - 40 - (x^{2} x) - x \cdot 5 - 5 x^{2} - 5 \cdot 5}{{(x - 8)}^{2}}$

Step 4.4.1.9.1.2

Multiply $x^{2}$ by $x$ .

Tap for more steps...

Step 4.4.1.9.1.2.1

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

$\frac{3 x^{3} - 14 x^{2} - 75 x - 40 - (x^{2} x^{1}) - x \cdot 5 - 5 x^{2} - 5 \cdot 5}{{(x - 8)}^{2}}$

Step 4.4.1.9.1.2.2

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

$\frac{3 x^{3} - 14 x^{2} - 75 x - 40 - x^{2 + 1} - x \cdot 5 - 5 x^{2} - 5 \cdot 5}{{(x - 8)}^{2}}$

Step 4.4.1.9.1.3

Add $2$ and $1$ .

$\frac{3 x^{3} - 14 x^{2} - 75 x - 40 - x^{3} - x \cdot 5 - 5 x^{2} - 5 \cdot 5}{{(x - 8)}^{2}}$

Step 4.4.1.9.2

Multiply $5$ by $- 1$ .

$\frac{3 x^{3} - 14 x^{2} - 75 x - 40 - x^{3} - 5 x - 5 x^{2} - 5 \cdot 5}{{(x - 8)}^{2}}$

Step 4.4.1.9.3

Multiply $- 5$ by $5$ .

$\frac{3 x^{3} - 14 x^{2} - 75 x - 40 - x^{3} - 5 x - 5 x^{2} - 25}{{(x - 8)}^{2}}$

Step 4.4.2

Subtract $x^{3}$ from $3 x^{3}$ .

$\frac{2 x^{3} - 14 x^{2} - 75 x - 40 - 5 x - 5 x^{2} - 25}{{(x - 8)}^{2}}$

Step 4.4.3

Subtract $5 x^{2}$ from $- 14 x^{2}$ .

$\frac{2 x^{3} - 19 x^{2} - 75 x - 40 - 5 x - 25}{{(x - 8)}^{2}}$

Step 4.4.4

Subtract $5 x$ from $- 75 x$ .

$\frac{2 x^{3} - 19 x^{2} - 80 x - 40 - 25}{{(x - 8)}^{2}}$

Step 4.4.5

Subtract $25$ from $- 40$ .

$\frac{2 x^{3} - 19 x^{2} - 80 x - 65}{{(x - 8)}^{2}}$