Precalculus Examples

$\log_{3} (9 x^{2}) - \log_{3} ({(3 x)}^{2})$

Step 1

Use the quotient property of logarithms, $\log_{b} (x) - \log_{b} (y) = \log_{b} (\frac{x}{y})$ .

$\log_{3} (\frac{9 x^{2}}{{(3 x)}^{2}})$

Step 2

Simplify the denominator.

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Step 2.1

Apply the product rule to $3 x$ .

$\log_{3} (\frac{9 x^{2}}{3^{2} x^{2}})$

Step 2.2

Raise $3$ to the power of $2$ .

$\log_{3} (\frac{9 x^{2}}{9 x^{2}})$

Step 3

Reduce the expression by cancelling the common factors.

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Step 3.1

Cancel the common factor of $9$ .

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Step 3.1.1

Cancel the common factor.

$\log_{3} (\frac{9 x^{2}}{9 x^{2}})$

Step 3.1.2

Rewrite the expression.

$\log_{3} (\frac{x^{2}}{x^{2}})$

Step 3.2

Cancel the common factor of $x^{2}$ .

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Step 3.2.1

Cancel the common factor.

$\log_{3} (\frac{x^{2}}{x^{2}})$

Step 3.2.2

Rewrite the expression.

$\log_{3} (1)$

Step 4

Logarithm base $3$ of $1$ is $0$ .

$0$