Calculus Examples

$2 x^{2} - 3 y^{2} = 4$

Step 1

Differentiate both sides of the equation.

$\frac{d}{d x} (2 x^{2} - 3 y^{2}) = \frac{d}{d x} (4)$

Step 2

Differentiate the left side of the equation.

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Step 2.1

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

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

Step 2.2

Evaluate $\frac{d}{d x} [2 x^{2}]$ .

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Step 2.2.1

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

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

Step 2.2.2

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

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

Step 2.2.3

Multiply $2$ by $2$ .

$4 x + \frac{d}{d x} [- 3 y^{2}]$

Step 2.3

Evaluate $\frac{d}{d x} [- 3 y^{2}]$ .

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Step 2.3.1

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

$4 x - 3 \frac{d}{d x} [y^{2}]$

Step 2.3.2

Differentiate using the chain rule, which states that $\frac{d}{d x} [f (g (x))]$ is $f' (g (x)) g' (x)$ where $f (x) = x^{2}$ and $g (x) = y$ .

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Step 2.3.2.1

To apply the Chain Rule, set $u$ as $y$ .

$4 x - 3 (\frac{d}{d u} [u^{2}] \frac{d}{d x} [y])$

Step 2.3.2.2

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

$4 x - 3 (2 u \frac{d}{d x} [y])$

Step 2.3.2.3

Replace all occurrences of $u$ with $y$ .

$4 x - 3 (2 y \frac{d}{d x} [y])$

Step 2.3.3

Rewrite $\frac{d}{d x} [y]$ as $y'$ .

$4 x - 3 (2 y y')$

Step 2.3.4

Multiply $2$ by $- 3$ .

$4 x - 6 y y'$

Step 2.4

Reorder terms.

$- 6 y y' + 4 x$

Step 3

Since $4$ is constant with respect to $x$ , the derivative of $4$ with respect to $x$ is $0$ .

$0$

Step 4

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

$- 6 y y' + 4 x = 0$

Step 5

Solve for $y'$ .

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Step 5.1

Subtract $4 x$ from both sides of the equation.

$- 6 y y' = - 4 x$

Step 5.2

Divide each term in $- 6 y y' = - 4 x$ by $- 6 y$ and simplify.

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Step 5.2.1

Divide each term in $- 6 y y' = - 4 x$ by $- 6 y$ .

$\frac{- 6 y y'}{- 6 y} = \frac{- 4 x}{- 6 y}$

Step 5.2.2

Simplify the left side.

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Step 5.2.2.1

Cancel the common factor of $- 6$ .

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Step 5.2.2.1.1

Cancel the common factor.

$\frac{- 6 y y'}{- 6 y} = \frac{- 4 x}{- 6 y}$

Step 5.2.2.1.2

Rewrite the expression.

$\frac{y y'}{y} = \frac{- 4 x}{- 6 y}$

Step 5.2.2.2

Cancel the common factor of $y$ .

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Step 5.2.2.2.1

Cancel the common factor.

$\frac{y y'}{y} = \frac{- 4 x}{- 6 y}$

Step 5.2.2.2.2

Divide $y'$ by $1$ .

$y' = \frac{- 4 x}{- 6 y}$

Step 5.2.3

Simplify the right side.

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Step 5.2.3.1

Cancel the common factor of $- 4$ and $- 6$ .

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Step 5.2.3.1.1

Factor $- 2$ out of $- 4 x$ .

$y' = \frac{- 2 (2 x)}{- 6 y}$

Step 5.2.3.1.2

Cancel the common factors.

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Step 5.2.3.1.2.1

Factor $- 2$ out of $- 6 y$ .

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

Step 5.2.3.1.2.2

Cancel the common factor.

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

Step 5.2.3.1.2.3

Rewrite the expression.

$y' = \frac{2 x}{3 y}$

Step 6

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

$\frac{d y}{d x} = \frac{2 x}{3 y}$