Precalculus Examples

$2^{2} \log_{2} (9)$

Step 1

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

$4 \log_{2} (9)$

Step 2

Simplify $4 \log_{2} (9)$ by moving $4$ inside the logarithm.

$\log_{2} (9^{4})$

Step 3

Raise $9$ to the power of $4$ .

$\log_{2} (6561)$

Step 4

Rewrite $\log_{2} (6561)$ using the change of base formula.

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Step 4.1

The change of base rule can be used if $a$ and $b$ are greater than $0$ and not equal to $1$ , and $x$ is greater than $0$ .

$\log_{a} (x) = \frac{\log_{b} (x)}{\log_{b} (a)}$

Step 4.2

Substitute in values for the variables in the change of base formula, using $b = 10$ .

$\frac{\log (6561)}{\log (2)}$

Step 5

The result can be shown in multiple forms.

Exact Form:

$\frac{\log (6561)}{\log (2)}$

Decimal Form:

$12.67970000 \dots$