Precalculus Examples

$\ln (\frac{\sqrt{x^{2} - a^{2}} \cdot \sqrt{y^{2} - b^{2}}}{e^{\frac{3}{2}}})$

Step 1

Rewrite $\ln (\frac{\sqrt{x^{2} - a^{2}} \cdot \sqrt{y^{2} - b^{2}}}{e^{\frac{3}{2}}})$ as $\ln (\sqrt{x^{2} - a^{2}} \cdot \sqrt{y^{2} - b^{2}}) - \ln (e^{\frac{3}{2}})$ .

$\ln (\sqrt{x^{2} - a^{2}} \cdot \sqrt{y^{2} - b^{2}}) - \ln (e^{\frac{3}{2}})$

Step 2

Use $\sqrt[n]{a^{x}} = a^{\frac{x}{n}}$ to rewrite $\sqrt{x^{2} - a^{2}}$ as ${(x^{2} - a^{2})}^{\frac{1}{2}}$ .

$\ln ({(x^{2} - a^{2})}^{\frac{1}{2}} \cdot \sqrt{y^{2} - b^{2}}) - \ln (e^{\frac{3}{2}})$

Step 3

Use $\sqrt[n]{a^{x}} = a^{\frac{x}{n}}$ to rewrite $\sqrt{y^{2} - b^{2}}$ as ${(y^{2} - b^{2})}^{\frac{1}{2}}$ .

$\ln ({(x^{2} - a^{2})}^{\frac{1}{2}} \cdot {(y^{2} - b^{2})}^{\frac{1}{2}}) - \ln (e^{\frac{3}{2}})$

Step 4

Expand $\ln (e^{\frac{3}{2}})$ by moving $\frac{3}{2}$ outside the logarithm.

$\ln ({(x^{2} - a^{2})}^{\frac{1}{2}} \cdot {(y^{2} - b^{2})}^{\frac{1}{2}}) - (\frac{3}{2} \ln (e))$

Step 5

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

$\ln ({(x^{2} - a^{2})}^{\frac{1}{2}} \cdot {(y^{2} - b^{2})}^{\frac{1}{2}}) - (\frac{3}{2} \cdot 1)$

Step 6

Multiply $\frac{3}{2}$ by $1$ .

$\ln ({(x^{2} - a^{2})}^{\frac{1}{2}} \cdot {(y^{2} - b^{2})}^{\frac{1}{2}}) - \frac{3}{2}$

Step 7

Rewrite $\ln ({(x^{2} - a^{2})}^{\frac{1}{2}} \cdot {(y^{2} - b^{2})}^{\frac{1}{2}})$ as $\ln ({(x^{2} - a^{2})}^{\frac{1}{2}}) + \ln ({(y^{2} - b^{2})}^{\frac{1}{2}})$ .

$\ln ({(x^{2} - a^{2})}^{\frac{1}{2}}) + \ln ({(y^{2} - b^{2})}^{\frac{1}{2}}) - \frac{3}{2}$

Step 8

Expand $\ln ({(x^{2} - a^{2})}^{\frac{1}{2}})$ by moving $\frac{1}{2}$ outside the logarithm.

$\frac{1}{2} \ln (x^{2} - a^{2}) + \ln ({(y^{2} - b^{2})}^{\frac{1}{2}}) - \frac{3}{2}$

Step 9

Expand $\ln ({(y^{2} - b^{2})}^{\frac{1}{2}})$ by moving $\frac{1}{2}$ outside the logarithm.

$\frac{1}{2} \ln (x^{2} - a^{2}) + \frac{1}{2} \ln (y^{2} - b^{2}) - \frac{3}{2}$

Step 10

Simplify each term.

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Step 10.1

Combine $\frac{1}{2}$ and $\ln (x^{2} - a^{2})$ .

$\frac{\ln (x^{2} - a^{2})}{2} + \frac{1}{2} \ln (y^{2} - b^{2}) - \frac{3}{2}$

Step 10.2

Combine $\frac{1}{2}$ and $\ln (y^{2} - b^{2})$ .

$\frac{\ln (x^{2} - a^{2})}{2} + \frac{\ln (y^{2} - b^{2})}{2} - \frac{3}{2}$

Step 11

Combine the numerators over the common denominator.

$\frac{\ln (x^{2} - a^{2}) + \ln (y^{2} - b^{2})}{2} - \frac{3}{2}$