Calculus Examples

$f (x) = (8 x + \sqrt{x}) (5 x^{2} + 3)$

Step 1

Use $\sqrt[n]{a^{x}} = a^{\frac{x}{n}}$ to rewrite $\sqrt{x}$ as $x^{\frac{1}{2}}$ .

$\frac{d}{d x} [(8 x + x^{\frac{1}{2}}) (5 x^{2} + 3)]$

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 $f (x) = 8 x + x^{\frac{1}{2}}$ and $g (x) = 5 x^{2} + 3$ .

$(8 x + x^{\frac{1}{2}}) \frac{d}{d x} [5 x^{2} + 3] + (5 x^{2} + 3) \frac{d}{d x} [8 x + x^{\frac{1}{2}}]$

Step 3

Differentiate.

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Step 3.1

By the Sum Rule, the derivative of $5 x^{2} + 3$ with respect to $x$ is $\frac{d}{d x} [5 x^{2}] + \frac{d}{d x} [3]$ .

$(8 x + x^{\frac{1}{2}}) (\frac{d}{d x} [5 x^{2}] + \frac{d}{d x} [3]) + (5 x^{2} + 3) \frac{d}{d x} [8 x + x^{\frac{1}{2}}]$

Step 3.2

Since $5$ is constant with respect to $x$ , the derivative of $5 x^{2}$ with respect to $x$ is $5 \frac{d}{d x} [x^{2}]$ .

$(8 x + x^{\frac{1}{2}}) (5 \frac{d}{d x} [x^{2}] + \frac{d}{d x} [3]) + (5 x^{2} + 3) \frac{d}{d x} [8 x + x^{\frac{1}{2}}]$

Step 3.3

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

$(8 x + x^{\frac{1}{2}}) (5 (2 x) + \frac{d}{d x} [3]) + (5 x^{2} + 3) \frac{d}{d x} [8 x + x^{\frac{1}{2}}]$

Step 3.4

Multiply $2$ by $5$ .

$(8 x + x^{\frac{1}{2}}) (10 x + \frac{d}{d x} [3]) + (5 x^{2} + 3) \frac{d}{d x} [8 x + x^{\frac{1}{2}}]$

Step 3.5

Since $3$ is constant with respect to $x$ , the derivative of $3$ with respect to $x$ is $0$ .

$(8 x + x^{\frac{1}{2}}) (10 x + 0) + (5 x^{2} + 3) \frac{d}{d x} [8 x + x^{\frac{1}{2}}]$

Step 3.6

Simplify the expression.

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Step 3.6.1

Add $10 x$ and $0$ .

$(8 x + x^{\frac{1}{2}}) (10 x) + (5 x^{2} + 3) \frac{d}{d x} [8 x + x^{\frac{1}{2}}]$

Step 3.6.2

Move $10$ to the left of $8 x + x^{\frac{1}{2}}$ .

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

Step 3.7

By the Sum Rule, the derivative of $8 x + x^{\frac{1}{2}}$ with respect to $x$ is $\frac{d}{d x} [8 x] + \frac{d}{d x} [x^{\frac{1}{2}}]$ .

$10 (8 x + x^{\frac{1}{2}}) x + (5 x^{2} + 3) (\frac{d}{d x} [8 x] + \frac{d}{d x} [x^{\frac{1}{2}}])$

Step 3.8

Since $8$ is constant with respect to $x$ , the derivative of $8 x$ with respect to $x$ is $8 \frac{d}{d x} [x]$ .

$10 (8 x + x^{\frac{1}{2}}) x + (5 x^{2} + 3) (8 \frac{d}{d x} [x] + \frac{d}{d x} [x^{\frac{1}{2}}])$

Step 3.9

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

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

Step 3.10

Multiply $8$ by $1$ .

$10 (8 x + x^{\frac{1}{2}}) x + (5 x^{2} + 3) (8 + \frac{d}{d x} [x^{\frac{1}{2}}])$

Step 3.11

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

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

Step 4

To write $- 1$ as a fraction with a common denominator, multiply by $\frac{2}{2}$ .

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

Step 5

Combine $- 1$ and $\frac{2}{2}$ .

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

Step 6

Combine the numerators over the common denominator.

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

Step 7

Simplify the numerator.

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Step 7.1

Multiply $- 1$ by $2$ .

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

Step 7.2

Subtract $2$ from $1$ .

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

Step 8

Move the negative in front of the fraction.

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

Step 9

Combine $\frac{1}{2}$ and $x^{- \frac{1}{2}}$ .

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

Step 10

Move $x^{- \frac{1}{2}}$ to the denominator using the negative exponent rule $b^{- n} = \frac{1}{b^{n}}$ .

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

Step 11

Simplify.

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Step 11.1

Apply the distributive property.

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

Step 11.2

Apply the distributive property.

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

Step 11.3

Combine terms.

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Step 11.3.1

Multiply $8$ by $10$ .

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

Step 11.3.2

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

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

Step 11.3.3

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

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

Step 11.3.4

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

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

Step 11.3.5

Add $1$ and $1$ .

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

Step 11.3.6

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

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

Step 11.3.7

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

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

Step 11.3.8

Write $1$ as a fraction with a common denominator.

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

Step 11.3.9

Combine the numerators over the common denominator.

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

Step 11.3.10

Add $2$ and $1$ .

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

Step 11.4

Reorder terms.

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

Step 11.5

Simplify each term.

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Step 11.5.1

Expand $(5 x^{2} + 3) (8 + \frac{1}{2 x^{\frac{1}{2}}})$ using the FOIL Method.

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Step 11.5.1.1

Apply the distributive property.

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

Step 11.5.1.2

Apply the distributive property.

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

Step 11.5.1.3

Apply the distributive property.

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

Step 11.5.2

Simplify each term.

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Step 11.5.2.1

Multiply $8$ by $5$ .

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

Step 11.5.2.2

Cancel the common factor of $x^{\frac{1}{2}}$ .

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Step 11.5.2.2.1

Factor $x^{\frac{1}{2}}$ out of $5 x^{2}$ .

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

Step 11.5.2.2.2

Factor $x^{\frac{1}{2}}$ out of $2 x^{\frac{1}{2}}$ .

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

Step 11.5.2.2.3

Cancel the common factor.

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

Step 11.5.2.2.4

Rewrite the expression.

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

Step 11.5.2.3

Combine $5$ and $\frac{1}{2}$ .

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

Step 11.5.2.4

Combine $x^{\frac{3}{2}}$ and $\frac{5}{2}$ .

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

Step 11.5.2.5

Move $5$ to the left of $x^{\frac{3}{2}}$ .

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

Step 11.5.2.6

Multiply $3$ by $8$ .

$80 x^{2} + 40 x^{2} + \frac{5 x^{\frac{3}{2}}}{2} + 24 + 3 \frac{1}{2 x^{\frac{1}{2}}} + 10 x^{\frac{3}{2}}$

Step 11.5.2.7

Combine $3$ and $\frac{1}{2 x^{\frac{1}{2}}}$ .

$80 x^{2} + 40 x^{2} + \frac{5 x^{\frac{3}{2}}}{2} + 24 + \frac{3}{2 x^{\frac{1}{2}}} + 10 x^{\frac{3}{2}}$

Step 11.6

Add $80 x^{2}$ and $40 x^{2}$ .

$120 x^{2} + \frac{5 x^{\frac{3}{2}}}{2} + 24 + \frac{3}{2 x^{\frac{1}{2}}} + 10 x^{\frac{3}{2}}$

Step 11.7

To write $10 x^{\frac{3}{2}}$ as a fraction with a common denominator, multiply by $\frac{2}{2}$ .

$120 x^{2} + \frac{5 x^{\frac{3}{2}}}{2} + 10 x^{\frac{3}{2}} \cdot \frac{2}{2} + 24 + \frac{3}{2 x^{\frac{1}{2}}}$

Step 11.8

Combine $10 x^{\frac{3}{2}}$ and $\frac{2}{2}$ .

$120 x^{2} + \frac{5 x^{\frac{3}{2}}}{2} + \frac{10 x^{\frac{3}{2}} \cdot 2}{2} + 24 + \frac{3}{2 x^{\frac{1}{2}}}$

Step 11.9

Combine the numerators over the common denominator.

$120 x^{2} + \frac{5 x^{\frac{3}{2}} + 10 x^{\frac{3}{2}} \cdot 2}{2} + 24 + \frac{3}{2 x^{\frac{1}{2}}}$

Step 11.10

Simplify the numerator.

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Step 11.10.1

Factor $5 x^{\frac{3}{2}}$ out of $5 x^{\frac{3}{2}} + 10 x^{\frac{3}{2}} \cdot 2$ .

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Step 11.10.1.1

Move $x^{\frac{3}{2}}$ .

$120 x^{2} + \frac{5 x^{\frac{3}{2}} + 10 \cdot 2 x^{\frac{3}{2}}}{2} + 24 + \frac{3}{2 x^{\frac{1}{2}}}$

Step 11.10.1.2

Factor $5 x^{\frac{3}{2}}$ out of $5 x^{\frac{3}{2}}$ .

$120 x^{2} + \frac{5 x^{\frac{3}{2}} (1) + 10 \cdot 2 x^{\frac{3}{2}}}{2} + 24 + \frac{3}{2 x^{\frac{1}{2}}}$

Step 11.10.1.3

Factor $5 x^{\frac{3}{2}}$ out of $10 \cdot 2 x^{\frac{3}{2}}$ .

$120 x^{2} + \frac{5 x^{\frac{3}{2}} (1) + 5 x^{\frac{3}{2}} (2 \cdot 2)}{2} + 24 + \frac{3}{2 x^{\frac{1}{2}}}$

Step 11.10.1.4

Factor $5 x^{\frac{3}{2}}$ out of $5 x^{\frac{3}{2}} (1) + 5 x^{\frac{3}{2}} (2 \cdot 2)$ .

$120 x^{2} + \frac{5 x^{\frac{3}{2}} (1 + 2 \cdot 2)}{2} + 24 + \frac{3}{2 x^{\frac{1}{2}}}$

Step 11.10.2

Multiply $2$ by $2$ .

$120 x^{2} + \frac{5 x^{\frac{3}{2}} (1 + 4)}{2} + 24 + \frac{3}{2 x^{\frac{1}{2}}}$

Step 11.10.3

Add $1$ and $4$ .

$120 x^{2} + \frac{5 x^{\frac{3}{2}} \cdot 5}{2} + 24 + \frac{3}{2 x^{\frac{1}{2}}}$

Step 11.10.4

Multiply $5$ by $5$ .

$120 x^{2} + \frac{25 x^{\frac{3}{2}}}{2} + 24 + \frac{3}{2 x^{\frac{1}{2}}}$