Calculus Examples

$lim_{x \to 0} \frac{x^{2} - 2 x}{x}$

Step 1

Apply L'Hospital's rule.

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Step 1.1

Evaluate the limit of the numerator and the limit of the denominator.

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Step 1.1.1

Take the limit of the numerator and the limit of the denominator.

$\frac{lim_{x \to 0} x^{2} - 2 x}{lim_{x \to 0} x}$

Step 1.1.2

Evaluate the limit of the numerator.

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Step 1.1.2.1

Split the limit using the Sum of Limits Rule on the limit as $x$ approaches $0$ .

$\frac{lim_{x \to 0} x^{2} - lim_{x \to 0} 2 x}{lim_{x \to 0} x}$

Step 1.1.2.2

Move the exponent $2$ from $x^{2}$ outside the limit using the Limits Power Rule.

$\frac{{(lim_{x \to 0} x)}^{2} - lim_{x \to 0} 2 x}{lim_{x \to 0} x}$

Step 1.1.2.3

Move the term $2$ outside of the limit because it is constant with respect to $x$ .

$\frac{{(lim_{x \to 0} x)}^{2} - 2 lim_{x \to 0} x}{lim_{x \to 0} x}$

Step 1.1.2.4

Evaluate the limits by plugging in $0$ for all occurrences of $x$ .

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Step 1.1.2.4.1

Evaluate the limit of $x$ by plugging in $0$ for $x$ .

$\frac{0^{2} - 2 lim_{x \to 0} x}{lim_{x \to 0} x}$

Step 1.1.2.4.2

Evaluate the limit of $x$ by plugging in $0$ for $x$ .

$\frac{0^{2} - 2 \cdot 0}{lim_{x \to 0} x}$

Step 1.1.2.5

Simplify the answer.

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Step 1.1.2.5.1

Simplify each term.

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Step 1.1.2.5.1.1

Raising $0$ to any positive power yields $0$ .

$\frac{0 - 2 \cdot 0}{lim_{x \to 0} x}$

Step 1.1.2.5.1.2

Multiply $- 2$ by $0$ .

$\frac{0 + 0}{lim_{x \to 0} x}$

Step 1.1.2.5.2

Add $0$ and $0$ .

$\frac{0}{lim_{x \to 0} x}$

Step 1.1.3

Evaluate the limit of $x$ by plugging in $0$ for $x$ .

$\frac{0}{0}$

Step 1.1.4

The expression contains a division by $0$ . The expression is undefined.

Undefined

$\frac{0}{0}$

Step 1.2

Since $\frac{0}{0}$ is of indeterminate form, apply L'Hospital's Rule. L'Hospital's Rule states that the limit of a quotient of functions is equal to the limit of the quotient of their derivatives.

$lim_{x \to 0} \frac{x^{2} - 2 x}{x} = lim_{x \to 0} \frac{\frac{d}{d x} [x^{2} - 2 x]}{\frac{d}{d x} [x]}$

Step 1.3

Find the derivative of the numerator and denominator.

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Step 1.3.1

Differentiate the numerator and denominator.

$lim_{x \to 0} \frac{\frac{d}{d x} [x^{2} - 2 x]}{\frac{d}{d x} [x]}$

Step 1.3.2

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

$lim_{x \to 0} \frac{\frac{d}{d x} [x^{2}] + \frac{d}{d x} [- 2 x]}{\frac{d}{d x} [x]}$

Step 1.3.3

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

$lim_{x \to 0} \frac{2 x + \frac{d}{d x} [- 2 x]}{\frac{d}{d x} [x]}$

Step 1.3.4

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

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Step 1.3.4.1

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

$lim_{x \to 0} \frac{2 x - 2 \frac{d}{d x} [x]}{\frac{d}{d x} [x]}$

Step 1.3.4.2

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

$lim_{x \to 0} \frac{2 x - 2 \cdot 1}{\frac{d}{d x} [x]}$

Step 1.3.4.3

Multiply $- 2$ by $1$ .

$lim_{x \to 0} \frac{2 x - 2}{\frac{d}{d x} [x]}$

Step 1.3.5

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

$lim_{x \to 0} \frac{2 x - 2}{1}$

Step 1.4

Divide $2 x - 2$ by $1$ .

$lim_{x \to 0} 2 x - 2$

Step 2

Evaluate the limit.

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Step 2.1

Split the limit using the Sum of Limits Rule on the limit as $x$ approaches $0$ .

$lim_{x \to 0} 2 x - lim_{x \to 0} 2$

Step 2.2

Move the term $2$ outside of the limit because it is constant with respect to $x$ .

$2 lim_{x \to 0} x - lim_{x \to 0} 2$

Step 2.3

Evaluate the limit of $2$ which is constant as $x$ approaches $0$ .

$2 lim_{x \to 0} x - 1 \cdot 2$

Step 3

Evaluate the limit of $x$ by plugging in $0$ for $x$ .

$2 \cdot 0 - 1 \cdot 2$

Step 4

Simplify the answer.

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Step 4.1

Simplify each term.

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Step 4.1.1

Multiply $2$ by $0$ .

$0 - 1 \cdot 2$

Step 4.1.2

Multiply $- 1$ by $2$ .

$0 - 2$

Step 4.2

Subtract $2$ from $0$ .

$- 2$