Calculus Examples

$y = \frac{1 - 6 x^{2}}{x^{4} - 6 x^{2} + 5}$

Step 1

Differentiate both sides of the equation.

$\frac{d}{d x} (y) = \frac{d}{d x} (\frac{1 - 6 x^{2}}{x^{4} - 6 x^{2} + 5})$

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

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 $f (x) = 1 - 6 x^{2}$ and $g (x) = x^{4} - 6 x^{2} + 5$ .

$\frac{(x^{4} - 6 x^{2} + 5) \frac{d}{d x} [1 - 6 x^{2}] - (1 - 6 x^{2}) \frac{d}{d x} [x^{4} - 6 x^{2} + 5]}{{(x^{4} - 6 x^{2} + 5)}^{2}}$

Step 3.2

Differentiate.

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Step 3.2.1

By the Sum Rule, the derivative of $1 - 6 x^{2}$ with respect to $x$ is $\frac{d}{d x} [1] + \frac{d}{d x} [- 6 x^{2}]$ .

$\frac{(x^{4} - 6 x^{2} + 5) (\frac{d}{d x} [1] + \frac{d}{d x} [- 6 x^{2}]) - (1 - 6 x^{2}) \frac{d}{d x} [x^{4} - 6 x^{2} + 5]}{{(x^{4} - 6 x^{2} + 5)}^{2}}$

Step 3.2.2

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

$\frac{(x^{4} - 6 x^{2} + 5) (0 + \frac{d}{d x} [- 6 x^{2}]) - (1 - 6 x^{2}) \frac{d}{d x} [x^{4} - 6 x^{2} + 5]}{{(x^{4} - 6 x^{2} + 5)}^{2}}$

Step 3.2.3

Add $0$ and $\frac{d}{d x} [- 6 x^{2}]$ .

$\frac{(x^{4} - 6 x^{2} + 5) \frac{d}{d x} [- 6 x^{2}] - (1 - 6 x^{2}) \frac{d}{d x} [x^{4} - 6 x^{2} + 5]}{{(x^{4} - 6 x^{2} + 5)}^{2}}$

Step 3.2.4

Since $- 6$ is constant with respect to $x$ , the derivative of $- 6 x^{2}$ with respect to $x$ is $- 6 \frac{d}{d x} [x^{2}]$ .

$\frac{(x^{4} - 6 x^{2} + 5) (- 6 \frac{d}{d x} [x^{2}]) - (1 - 6 x^{2}) \frac{d}{d x} [x^{4} - 6 x^{2} + 5]}{{(x^{4} - 6 x^{2} + 5)}^{2}}$

Step 3.2.5

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

$\frac{(x^{4} - 6 x^{2} + 5) (- 6 (2 x)) - (1 - 6 x^{2}) \frac{d}{d x} [x^{4} - 6 x^{2} + 5]}{{(x^{4} - 6 x^{2} + 5)}^{2}}$

Step 3.2.6

Multiply $2$ by $- 6$ .

$\frac{(x^{4} - 6 x^{2} + 5) (- 12 x) - (1 - 6 x^{2}) \frac{d}{d x} [x^{4} - 6 x^{2} + 5]}{{(x^{4} - 6 x^{2} + 5)}^{2}}$

Step 3.2.7

By the Sum Rule, the derivative of $x^{4} - 6 x^{2} + 5$ with respect to $x$ is $\frac{d}{d x} [x^{4}] + \frac{d}{d x} [- 6 x^{2}] + \frac{d}{d x} [5]$ .

$\frac{(x^{4} - 6 x^{2} + 5) (- 12 x) - (1 - 6 x^{2}) (\frac{d}{d x} [x^{4}] + \frac{d}{d x} [- 6 x^{2}] + \frac{d}{d x} [5])}{{(x^{4} - 6 x^{2} + 5)}^{2}}$

Step 3.2.8

Differentiate using the Power Rule which states that $\frac{d}{d x} [x^{n}]$ is $n x^{n - 1}$ where $n = 4$ .

$\frac{(x^{4} - 6 x^{2} + 5) (- 12 x) - (1 - 6 x^{2}) (4 x^{3} + \frac{d}{d x} [- 6 x^{2}] + \frac{d}{d x} [5])}{{(x^{4} - 6 x^{2} + 5)}^{2}}$

Step 3.2.9

Since $- 6$ is constant with respect to $x$ , the derivative of $- 6 x^{2}$ with respect to $x$ is $- 6 \frac{d}{d x} [x^{2}]$ .

$\frac{(x^{4} - 6 x^{2} + 5) (- 12 x) - (1 - 6 x^{2}) (4 x^{3} - 6 \frac{d}{d x} [x^{2}] + \frac{d}{d x} [5])}{{(x^{4} - 6 x^{2} + 5)}^{2}}$

Step 3.2.10

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

$\frac{(x^{4} - 6 x^{2} + 5) (- 12 x) - (1 - 6 x^{2}) (4 x^{3} - 6 (2 x) + \frac{d}{d x} [5])}{{(x^{4} - 6 x^{2} + 5)}^{2}}$

Step 3.2.11

Multiply $2$ by $- 6$ .

$\frac{(x^{4} - 6 x^{2} + 5) (- 12 x) - (1 - 6 x^{2}) (4 x^{3} - 12 x + \frac{d}{d x} [5])}{{(x^{4} - 6 x^{2} + 5)}^{2}}$

Step 3.2.12

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

$\frac{(x^{4} - 6 x^{2} + 5) (- 12 x) - (1 - 6 x^{2}) (4 x^{3} - 12 x + 0)}{{(x^{4} - 6 x^{2} + 5)}^{2}}$

Step 3.2.13

Add $4 x^{3} - 12 x$ and $0$ .

$\frac{(x^{4} - 6 x^{2} + 5) (- 12 x) - (1 - 6 x^{2}) (4 x^{3} - 12 x)}{{(x^{4} - 6 x^{2} + 5)}^{2}}$

Step 3.3

Simplify.

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Step 3.3.1

Apply the distributive property.

$\frac{x^{4} (- 12 x) - 6 x^{2} (- 12 x) + 5 (- 12 x) - (1 - 6 x^{2}) (4 x^{3} - 12 x)}{{(x^{4} - 6 x^{2} + 5)}^{2}}$

Step 3.3.2

Apply the distributive property.

$\frac{x^{4} (- 12 x) - 6 x^{2} (- 12 x) + 5 (- 12 x) + (- 1 \cdot 1 - (- 6 x^{2})) (4 x^{3} - 12 x)}{{(x^{4} - 6 x^{2} + 5)}^{2}}$

Step 3.3.3

Simplify the numerator.

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Step 3.3.3.1

Simplify each term.

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Step 3.3.3.1.1

Rewrite using the commutative property of multiplication.

$\frac{- 12 x^{4} x - 6 x^{2} (- 12 x) + 5 (- 12 x) + (- 1 \cdot 1 - (- 6 x^{2})) (4 x^{3} - 12 x)}{{(x^{4} - 6 x^{2} + 5)}^{2}}$

Step 3.3.3.1.2

Multiply $x^{4}$ by $x$ by adding the exponents.

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Step 3.3.3.1.2.1

Move $x$ .

$\frac{- 12 (x \cdot x^{4}) - 6 x^{2} (- 12 x) + 5 (- 12 x) + (- 1 \cdot 1 - (- 6 x^{2})) (4 x^{3} - 12 x)}{{(x^{4} - 6 x^{2} + 5)}^{2}}$

Step 3.3.3.1.2.2

Multiply $x$ by $x^{4}$ .

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Step 3.3.3.1.2.2.1

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

$\frac{- 12 (x^{1} x^{4}) - 6 x^{2} (- 12 x) + 5 (- 12 x) + (- 1 \cdot 1 - (- 6 x^{2})) (4 x^{3} - 12 x)}{{(x^{4} - 6 x^{2} + 5)}^{2}}$

Step 3.3.3.1.2.2.2

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

$\frac{- 12 x^{1 + 4} - 6 x^{2} (- 12 x) + 5 (- 12 x) + (- 1 \cdot 1 - (- 6 x^{2})) (4 x^{3} - 12 x)}{{(x^{4} - 6 x^{2} + 5)}^{2}}$

Step 3.3.3.1.2.3

Add $1$ and $4$ .

$\frac{- 12 x^{5} - 6 x^{2} (- 12 x) + 5 (- 12 x) + (- 1 \cdot 1 - (- 6 x^{2})) (4 x^{3} - 12 x)}{{(x^{4} - 6 x^{2} + 5)}^{2}}$

Step 3.3.3.1.3

Rewrite using the commutative property of multiplication.

$\frac{- 12 x^{5} - 6 \cdot - 12 x^{2} x + 5 (- 12 x) + (- 1 \cdot 1 - (- 6 x^{2})) (4 x^{3} - 12 x)}{{(x^{4} - 6 x^{2} + 5)}^{2}}$

Step 3.3.3.1.4

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

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Step 3.3.3.1.4.1

Move $x$ .

$\frac{- 12 x^{5} - 6 \cdot - 12 (x \cdot x^{2}) + 5 (- 12 x) + (- 1 \cdot 1 - (- 6 x^{2})) (4 x^{3} - 12 x)}{{(x^{4} - 6 x^{2} + 5)}^{2}}$

Step 3.3.3.1.4.2

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

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Step 3.3.3.1.4.2.1

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

$\frac{- 12 x^{5} - 6 \cdot - 12 (x^{1} x^{2}) + 5 (- 12 x) + (- 1 \cdot 1 - (- 6 x^{2})) (4 x^{3} - 12 x)}{{(x^{4} - 6 x^{2} + 5)}^{2}}$

Step 3.3.3.1.4.2.2

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

$\frac{- 12 x^{5} - 6 \cdot - 12 x^{1 + 2} + 5 (- 12 x) + (- 1 \cdot 1 - (- 6 x^{2})) (4 x^{3} - 12 x)}{{(x^{4} - 6 x^{2} + 5)}^{2}}$

Step 3.3.3.1.4.3

Add $1$ and $2$ .

$\frac{- 12 x^{5} - 6 \cdot - 12 x^{3} + 5 (- 12 x) + (- 1 \cdot 1 - (- 6 x^{2})) (4 x^{3} - 12 x)}{{(x^{4} - 6 x^{2} + 5)}^{2}}$

Step 3.3.3.1.5

Multiply $- 6$ by $- 12$ .

$\frac{- 12 x^{5} + 72 x^{3} + 5 (- 12 x) + (- 1 \cdot 1 - (- 6 x^{2})) (4 x^{3} - 12 x)}{{(x^{4} - 6 x^{2} + 5)}^{2}}$

Step 3.3.3.1.6

Multiply $- 12$ by $5$ .

$\frac{- 12 x^{5} + 72 x^{3} - 60 x + (- 1 \cdot 1 - (- 6 x^{2})) (4 x^{3} - 12 x)}{{(x^{4} - 6 x^{2} + 5)}^{2}}$

Step 3.3.3.1.7

Simplify each term.

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Step 3.3.3.1.7.1

Multiply $- 1$ by $1$ .

$\frac{- 12 x^{5} + 72 x^{3} - 60 x + (- 1 - (- 6 x^{2})) (4 x^{3} - 12 x)}{{(x^{4} - 6 x^{2} + 5)}^{2}}$

Step 3.3.3.1.7.2

Multiply $- 6$ by $- 1$ .

$\frac{- 12 x^{5} + 72 x^{3} - 60 x + (- 1 + 6 x^{2}) (4 x^{3} - 12 x)}{{(x^{4} - 6 x^{2} + 5)}^{2}}$

Step 3.3.3.1.8

Expand $(- 1 + 6 x^{2}) (4 x^{3} - 12 x)$ using the FOIL Method.

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Step 3.3.3.1.8.1

Apply the distributive property.

$\frac{- 12 x^{5} + 72 x^{3} - 60 x - 1 (4 x^{3} - 12 x) + 6 x^{2} (4 x^{3} - 12 x)}{{(x^{4} - 6 x^{2} + 5)}^{2}}$

Step 3.3.3.1.8.2

Apply the distributive property.

$\frac{- 12 x^{5} + 72 x^{3} - 60 x - 1 (4 x^{3}) - 1 (- 12 x) + 6 x^{2} (4 x^{3} - 12 x)}{{(x^{4} - 6 x^{2} + 5)}^{2}}$

Step 3.3.3.1.8.3

Apply the distributive property.

$\frac{- 12 x^{5} + 72 x^{3} - 60 x - 1 (4 x^{3}) - 1 (- 12 x) + 6 x^{2} (4 x^{3}) + 6 x^{2} (- 12 x)}{{(x^{4} - 6 x^{2} + 5)}^{2}}$

Step 3.3.3.1.9

Simplify and combine like terms.

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Step 3.3.3.1.9.1

Simplify each term.

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Step 3.3.3.1.9.1.1

Multiply $4$ by $- 1$ .

$\frac{- 12 x^{5} + 72 x^{3} - 60 x - 4 x^{3} - 1 (- 12 x) + 6 x^{2} (4 x^{3}) + 6 x^{2} (- 12 x)}{{(x^{4} - 6 x^{2} + 5)}^{2}}$

Step 3.3.3.1.9.1.2

Multiply $- 12$ by $- 1$ .

$\frac{- 12 x^{5} + 72 x^{3} - 60 x - 4 x^{3} + 12 x + 6 x^{2} (4 x^{3}) + 6 x^{2} (- 12 x)}{{(x^{4} - 6 x^{2} + 5)}^{2}}$

Step 3.3.3.1.9.1.3

Rewrite using the commutative property of multiplication.

$\frac{- 12 x^{5} + 72 x^{3} - 60 x - 4 x^{3} + 12 x + 6 \cdot 4 x^{2} x^{3} + 6 x^{2} (- 12 x)}{{(x^{4} - 6 x^{2} + 5)}^{2}}$

Step 3.3.3.1.9.1.4

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

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Step 3.3.3.1.9.1.4.1

Move $x^{3}$ .

$\frac{- 12 x^{5} + 72 x^{3} - 60 x - 4 x^{3} + 12 x + 6 \cdot 4 (x^{3} x^{2}) + 6 x^{2} (- 12 x)}{{(x^{4} - 6 x^{2} + 5)}^{2}}$

Step 3.3.3.1.9.1.4.2

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

$\frac{- 12 x^{5} + 72 x^{3} - 60 x - 4 x^{3} + 12 x + 6 \cdot 4 x^{3 + 2} + 6 x^{2} (- 12 x)}{{(x^{4} - 6 x^{2} + 5)}^{2}}$

Step 3.3.3.1.9.1.4.3

Add $3$ and $2$ .

$\frac{- 12 x^{5} + 72 x^{3} - 60 x - 4 x^{3} + 12 x + 6 \cdot 4 x^{5} + 6 x^{2} (- 12 x)}{{(x^{4} - 6 x^{2} + 5)}^{2}}$

Step 3.3.3.1.9.1.5

Multiply $6$ by $4$ .

$\frac{- 12 x^{5} + 72 x^{3} - 60 x - 4 x^{3} + 12 x + 24 x^{5} + 6 x^{2} (- 12 x)}{{(x^{4} - 6 x^{2} + 5)}^{2}}$

Step 3.3.3.1.9.1.6

Rewrite using the commutative property of multiplication.

$\frac{- 12 x^{5} + 72 x^{3} - 60 x - 4 x^{3} + 12 x + 24 x^{5} + 6 \cdot - 12 x^{2} x}{{(x^{4} - 6 x^{2} + 5)}^{2}}$

Step 3.3.3.1.9.1.7

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

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Step 3.3.3.1.9.1.7.1

Move $x$ .

$\frac{- 12 x^{5} + 72 x^{3} - 60 x - 4 x^{3} + 12 x + 24 x^{5} + 6 \cdot - 12 (x \cdot x^{2})}{{(x^{4} - 6 x^{2} + 5)}^{2}}$

Step 3.3.3.1.9.1.7.2

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

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Step 3.3.3.1.9.1.7.2.1

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

$\frac{- 12 x^{5} + 72 x^{3} - 60 x - 4 x^{3} + 12 x + 24 x^{5} + 6 \cdot - 12 (x^{1} x^{2})}{{(x^{4} - 6 x^{2} + 5)}^{2}}$

Step 3.3.3.1.9.1.7.2.2

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

$\frac{- 12 x^{5} + 72 x^{3} - 60 x - 4 x^{3} + 12 x + 24 x^{5} + 6 \cdot - 12 x^{1 + 2}}{{(x^{4} - 6 x^{2} + 5)}^{2}}$

Step 3.3.3.1.9.1.7.3

Add $1$ and $2$ .

$\frac{- 12 x^{5} + 72 x^{3} - 60 x - 4 x^{3} + 12 x + 24 x^{5} + 6 \cdot - 12 x^{3}}{{(x^{4} - 6 x^{2} + 5)}^{2}}$

Step 3.3.3.1.9.1.8

Multiply $6$ by $- 12$ .

$\frac{- 12 x^{5} + 72 x^{3} - 60 x - 4 x^{3} + 12 x + 24 x^{5} - 72 x^{3}}{{(x^{4} - 6 x^{2} + 5)}^{2}}$

Step 3.3.3.1.9.2

Subtract $72 x^{3}$ from $- 4 x^{3}$ .

$\frac{- 12 x^{5} + 72 x^{3} - 60 x - 76 x^{3} + 12 x + 24 x^{5}}{{(x^{4} - 6 x^{2} + 5)}^{2}}$

Step 3.3.3.2

Add $- 12 x^{5}$ and $24 x^{5}$ .

$\frac{12 x^{5} + 72 x^{3} - 60 x - 76 x^{3} + 12 x}{{(x^{4} - 6 x^{2} + 5)}^{2}}$

Step 3.3.3.3

Subtract $76 x^{3}$ from $72 x^{3}$ .

$\frac{12 x^{5} - 4 x^{3} - 60 x + 12 x}{{(x^{4} - 6 x^{2} + 5)}^{2}}$

Step 3.3.3.4

Add $- 60 x$ and $12 x$ .

$\frac{12 x^{5} - 4 x^{3} - 48 x}{{(x^{4} - 6 x^{2} + 5)}^{2}}$

Step 4

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

$y' = \frac{12 x^{5} - 4 x^{3} - 48 x}{{(x^{4} - 6 x^{2} + 5)}^{2}}$

Step 5

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

$\frac{d y}{d x} = \frac{12 x^{5} - 4 x^{3} - 48 x}{{(x^{4} - 6 x^{2} + 5)}^{2}}$