Calculus Examples

$(3 x + 1) (5 x^{2} - 6 x + 3)$

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 $f (x) = 3 x + 1$ and $g (x) = 5 x^{2} - 6 x + 3$ .

$(3 x + 1) \frac{d}{d x} [5 x^{2} - 6 x + 3] + (5 x^{2} - 6 x + 3) \frac{d}{d x} [3 x + 1]$

Step 2

Differentiate.

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Step 2.1

By the Sum Rule, the derivative of $5 x^{2} - 6 x + 3$ with respect to $x$ is $\frac{d}{d x} [5 x^{2}] + \frac{d}{d x} [- 6 x] + \frac{d}{d x} [3]$ .

$(3 x + 1) (\frac{d}{d x} [5 x^{2}] + \frac{d}{d x} [- 6 x] + \frac{d}{d x} [3]) + (5 x^{2} - 6 x + 3) \frac{d}{d x} [3 x + 1]$

Step 2.2

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

$(3 x + 1) (5 \frac{d}{d x} [x^{2}] + \frac{d}{d x} [- 6 x] + \frac{d}{d x} [3]) + (5 x^{2} - 6 x + 3) \frac{d}{d x} [3 x + 1]$

Step 2.3

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

$(3 x + 1) (5 (2 x) + \frac{d}{d x} [- 6 x] + \frac{d}{d x} [3]) + (5 x^{2} - 6 x + 3) \frac{d}{d x} [3 x + 1]$

Step 2.4

Multiply $2$ by $5$ .

$(3 x + 1) (10 x + \frac{d}{d x} [- 6 x] + \frac{d}{d x} [3]) + (5 x^{2} - 6 x + 3) \frac{d}{d x} [3 x + 1]$

Step 2.5

Since $- 6$ is constant with respect to $x$ , the derivative of $- 6 x$ with respect to $x$ is $- 6 \frac{d}{d x} [x]$ .

$(3 x + 1) (10 x - 6 \frac{d}{d x} [x] + \frac{d}{d x} [3]) + (5 x^{2} - 6 x + 3) \frac{d}{d x} [3 x + 1]$

Step 2.6

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

$(3 x + 1) (10 x - 6 \cdot 1 + \frac{d}{d x} [3]) + (5 x^{2} - 6 x + 3) \frac{d}{d x} [3 x + 1]$

Step 2.7

Multiply $- 6$ by $1$ .

$(3 x + 1) (10 x - 6 + \frac{d}{d x} [3]) + (5 x^{2} - 6 x + 3) \frac{d}{d x} [3 x + 1]$

Step 2.8

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

$(3 x + 1) (10 x - 6 + 0) + (5 x^{2} - 6 x + 3) \frac{d}{d x} [3 x + 1]$

Step 2.9

Add $10 x - 6$ and $0$ .

$(3 x + 1) (10 x - 6) + (5 x^{2} - 6 x + 3) \frac{d}{d x} [3 x + 1]$

Step 2.10

By the Sum Rule, the derivative of $3 x + 1$ with respect to $x$ is $\frac{d}{d x} [3 x] + \frac{d}{d x} [1]$ .

$(3 x + 1) (10 x - 6) + (5 x^{2} - 6 x + 3) (\frac{d}{d x} [3 x] + \frac{d}{d x} [1])$

Step 2.11

Since $3$ is constant with respect to $x$ , the derivative of $3 x$ with respect to $x$ is $3 \frac{d}{d x} [x]$ .

$(3 x + 1) (10 x - 6) + (5 x^{2} - 6 x + 3) (3 \frac{d}{d x} [x] + \frac{d}{d x} [1])$

Step 2.12

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

$(3 x + 1) (10 x - 6) + (5 x^{2} - 6 x + 3) (3 \cdot 1 + \frac{d}{d x} [1])$

Step 2.13

Multiply $3$ by $1$ .

$(3 x + 1) (10 x - 6) + (5 x^{2} - 6 x + 3) (3 + \frac{d}{d x} [1])$

Step 2.14

Since $1$ is constant with respect to $x$ , the derivative of $1$ with respect to $x$ is $0$ .

$(3 x + 1) (10 x - 6) + (5 x^{2} - 6 x + 3) (3 + 0)$

Step 2.15

Simplify the expression.

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Step 2.15.1

Add $3$ and $0$ .

$(3 x + 1) (10 x - 6) + (5 x^{2} - 6 x + 3) \cdot 3$

Step 2.15.2

Move $3$ to the left of $5 x^{2} - 6 x + 3$ .

$(3 x + 1) (10 x - 6) + 3 \cdot (5 x^{2} - 6 x + 3)$

Step 3

Simplify.

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Step 3.1

Apply the distributive property.

$(3 x + 1) (10 x - 6) + 3 (5 x^{2}) + 3 (- 6 x) + 3 \cdot 3$

Step 3.2

Apply the distributive property.

$(3 x + 1) (10 x) + (3 x + 1) \cdot - 6 + 3 (5 x^{2}) + 3 (- 6 x) + 3 \cdot 3$

Step 3.3

Apply the distributive property.

$3 x (10 x) + 1 (10 x) + (3 x + 1) \cdot - 6 + 3 (5 x^{2}) + 3 (- 6 x) + 3 \cdot 3$

Step 3.4

Apply the distributive property.

$3 x (10 x) + 1 (10 x) + 3 x \cdot - 6 + 1 \cdot - 6 + 3 (5 x^{2}) + 3 (- 6 x) + 3 \cdot 3$

Step 3.5

Combine terms.

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Step 3.5.1

Multiply $10$ by $3$ .

$30 x \cdot x + 1 (10 x) + 3 x \cdot - 6 + 1 \cdot - 6 + 3 (5 x^{2}) + 3 (- 6 x) + 3 \cdot 3$

Step 3.5.2

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

$30 (x^{1} x) + 1 (10 x) + 3 x \cdot - 6 + 1 \cdot - 6 + 3 (5 x^{2}) + 3 (- 6 x) + 3 \cdot 3$

Step 3.5.3

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

$30 (x^{1} x^{1}) + 1 (10 x) + 3 x \cdot - 6 + 1 \cdot - 6 + 3 (5 x^{2}) + 3 (- 6 x) + 3 \cdot 3$

Step 3.5.4

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

$30 x^{1 + 1} + 1 (10 x) + 3 x \cdot - 6 + 1 \cdot - 6 + 3 (5 x^{2}) + 3 (- 6 x) + 3 \cdot 3$

Step 3.5.5

Add $1$ and $1$ .

$30 x^{2} + 1 (10 x) + 3 x \cdot - 6 + 1 \cdot - 6 + 3 (5 x^{2}) + 3 (- 6 x) + 3 \cdot 3$

Step 3.5.6

Multiply $10$ by $1$ .

$30 x^{2} + 10 x + 3 x \cdot - 6 + 1 \cdot - 6 + 3 (5 x^{2}) + 3 (- 6 x) + 3 \cdot 3$

Step 3.5.7

Multiply $- 6$ by $3$ .

$30 x^{2} + 10 x - 18 x + 1 \cdot - 6 + 3 (5 x^{2}) + 3 (- 6 x) + 3 \cdot 3$

Step 3.5.8

Multiply $- 6$ by $1$ .

$30 x^{2} + 10 x - 18 x - 6 + 3 (5 x^{2}) + 3 (- 6 x) + 3 \cdot 3$

Step 3.5.9

Subtract $18 x$ from $10 x$ .

$30 x^{2} - 8 x - 6 + 3 (5 x^{2}) + 3 (- 6 x) + 3 \cdot 3$

Step 3.5.10

Multiply $5$ by $3$ .

$30 x^{2} - 8 x - 6 + 15 x^{2} + 3 (- 6 x) + 3 \cdot 3$

Step 3.5.11

Multiply $- 6$ by $3$ .

$30 x^{2} - 8 x - 6 + 15 x^{2} - 18 x + 3 \cdot 3$

Step 3.5.12

Multiply $3$ by $3$ .

$30 x^{2} - 8 x - 6 + 15 x^{2} - 18 x + 9$

Step 3.5.13

Add $30 x^{2}$ and $15 x^{2}$ .

$45 x^{2} - 8 x - 6 - 18 x + 9$

Step 3.5.14

Subtract $18 x$ from $- 8 x$ .

$45 x^{2} - 26 x - 6 + 9$

Step 3.5.15

Add $- 6$ and $9$ .

$45 x^{2} - 26 x + 3$