Calculus Examples

$4 \ln (x)$

Find the asymptotes.

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Set the argument of the logarithm equal to zero.

$x^{4} = 0$

Solve for $x$ .

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Take the 4th root of both sides of the equation to eliminate the exponent on the left side.

$x = \pm \sqrt[4]{0}$

Simplify $\pm \sqrt[4]{0}$ .

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Rewrite $0$ as $0^{4}$ .

$x = \pm \sqrt[4]{0^{4}}$

Pull terms out from under the radical, assuming positive real numbers.

$x = \pm 0$

Plus or minus $0$ is $0$ .

$x = 0$

The vertical asymptote occurs at $x = 0$ .

Vertical Asymptote: $x = 0$

Find the point at $x = 1$ .

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Replace the variable $x$ with $1$ in the expression.

$f (1) = 4 \ln (1)$

Simplify the result.

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The natural logarithm of $1$ is $0$ .

$f (1) = 4 \cdot 0$

Multiply $4$ by $0$ .

$f (1) = 0$

The final answer is $0$ .

$0$

Convert $0$ to decimal.

$y = 0$

Find the point at $x = 2$ .

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Replace the variable $x$ with $2$ in the expression.

$f (2) = 4 \ln (2)$

Simplify the result.

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Simplify $4 \ln (2)$ by moving $4$ inside the logarithm.

$f (2) = \ln (2^{4})$

Raise $2$ to the power of $4$ .

$f (2) = \ln (16)$

The final answer is $\ln (16)$ .

$\ln (16)$

Convert $\ln (16)$ to decimal.

$y = 2.77258872$

Find the point at $x = 3$ .

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Replace the variable $x$ with $3$ in the expression.

$f (3) = 4 \ln (3)$

Simplify the result.

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Simplify $4 \ln (3)$ by moving $4$ inside the logarithm.

$f (3) = \ln (3^{4})$

Raise $3$ to the power of $4$ .

$f (3) = \ln (81)$

The final answer is $\ln (81)$ .

$\ln (81)$

Convert $\ln (81)$ to decimal.

$y = 4.39444915$

The log function can be graphed using the vertical asymptote at $x = 0$ and the points $(1, 0), (2, 2.77258872), (3, 4.39444915)$ .

Vertical Asymptote: $x = 0$

$\begin{array}{c} x & y \\ 1 & 0 \\ 2 & 2.773 \\ 3 & 4.394 \end{array}$