Calculus Examples

$y = \frac{3 x^{3}}{2 x^{3} - 1}$

Step 1

Differentiate both sides of the equation.

$\frac{d}{d x} (y) = \frac{d}{d x} (\frac{3 x^{3}}{2 x^{3} - 1})$

Step 2

The derivative of $y$ with respect to $x$ is $y'$ .

$y'$

Step 3

Differentiate the right side of the equation.

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Step 3.1

Since $3$ is constant with respect to $x$ , the derivative of $\frac{3 x^{3}}{2 x^{3} - 1}$ with respect to $x$ is $3 \frac{d}{d x} [\frac{x^{3}}{2 x^{3} - 1}]$ .

$3 \frac{d}{d x} [\frac{x^{3}}{2 x^{3} - 1}]$

Step 3.2

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

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

Step 3.3

Differentiate.

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Step 3.3.1

Differentiate using the Power Rule which states that $\frac{d}{d x} [x^{n}]$ is $n x^{n - 1}$ where $n = 3$ .

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

Step 3.3.2

Move $3$ to the left of $2 x^{3} - 1$ .

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

Step 3.3.3

By the Sum Rule, the derivative of $2 x^{3} - 1$ with respect to $x$ is $\frac{d}{d x} [2 x^{3}] + \frac{d}{d x} [- 1]$ .

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

Step 3.3.4

Since $2$ is constant with respect to $x$ , the derivative of $2 x^{3}$ with respect to $x$ is $2 \frac{d}{d x} [x^{3}]$ .

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

Step 3.3.5

Differentiate using the Power Rule which states that $\frac{d}{d x} [x^{n}]$ is $n x^{n - 1}$ where $n = 3$ .

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

Step 3.3.6

Multiply $3$ by $2$ .

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

Step 3.3.7

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

$3 \frac{3 (2 x^{3} - 1) x^{2} - x^{3} (6 x^{2} + 0)}{{(2 x^{3} - 1)}^{2}}$

Step 3.3.8

Simplify the expression.

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Step 3.3.8.1

Add $6 x^{2}$ and $0$ .

$3 \frac{3 (2 x^{3} - 1) x^{2} - x^{3} (6 x^{2})}{{(2 x^{3} - 1)}^{2}}$

Step 3.3.8.2

Multiply $6$ by $- 1$ .

$3 \frac{3 (2 x^{3} - 1) x^{2} - 6 x^{3} x^{2}}{{(2 x^{3} - 1)}^{2}}$

Step 3.4

Multiply $x^{3}$ by $x^{2}$ by adding the exponents.

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Step 3.4.1

Move $x^{2}$ .

$3 \frac{3 (2 x^{3} - 1) x^{2} - 6 (x^{2} x^{3})}{{(2 x^{3} - 1)}^{2}}$

Step 3.4.2

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

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

Step 3.4.3

Add $2$ and $3$ .

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

Step 3.5

Combine $3$ and $\frac{3 (2 x^{3} - 1) x^{2} - 6 x^{5}}{{(2 x^{3} - 1)}^{2}}$ .

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

Step 3.6

Simplify.

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Step 3.6.1

Apply the distributive property.

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

Step 3.6.2

Apply the distributive property.

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

Step 3.6.3

Apply the distributive property.

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

Step 3.6.4

Simplify the numerator.

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Step 3.6.4.1

Simplify each term.

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Step 3.6.4.1.1

Multiply $x^{3}$ by $x^{2}$ by adding the exponents.

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Step 3.6.4.1.1.1

Move $x^{2}$ .

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

Step 3.6.4.1.1.2

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

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

Step 3.6.4.1.1.3

Add $2$ and $3$ .

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

Step 3.6.4.1.2

Multiply $2$ by $3$ .

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

Step 3.6.4.1.3

Multiply $6$ by $3$ .

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

Step 3.6.4.1.4

Multiply $3$ by $- 1$ .

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

Step 3.6.4.1.5

Multiply $- 3$ by $3$ .

$\frac{18 x^{5} - 9 x^{2} + 3 (- 6 x^{5})}{{(2 x^{3} - 1)}^{2}}$

Step 3.6.4.1.6

Multiply $- 6$ by $3$ .

$\frac{18 x^{5} - 9 x^{2} - 18 x^{5}}{{(2 x^{3} - 1)}^{2}}$

Step 3.6.4.2

Combine the opposite terms in $18 x^{5} - 9 x^{2} - 18 x^{5}$ .

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Step 3.6.4.2.1

Subtract $18 x^{5}$ from $18 x^{5}$ .

$\frac{- 9 x^{2} + 0}{{(2 x^{3} - 1)}^{2}}$

Step 3.6.4.2.2

Add $- 9 x^{2}$ and $0$ .

$\frac{- 9 x^{2}}{{(2 x^{3} - 1)}^{2}}$

Step 3.6.5

Move the negative in front of the fraction.

$- \frac{9 x^{2}}{{(2 x^{3} - 1)}^{2}}$

Step 4

Reform the equation by setting the left side equal to the right side.

$y' = - \frac{9 x^{2}}{{(2 x^{3} - 1)}^{2}}$

Step 5

Replace $y'$ with $\frac{d y}{d x}$ .

$\frac{d y}{d x} = - \frac{9 x^{2}}{{(2 x^{3} - 1)}^{2}}$