Algebra Examples

log (100)

$\log (100)$

Step 1

Rewrite as an equation.

log (100) = x

$\log (100) = x$

Step 2

Rewrite

log (100) = x

$\log (100) = x$ in exponential form using the definition of a logarithm. If

x

$x$ and

b

$b$ are positive real numbers and

b

$b$ does not equal

1

$1$ , then

{log}_{b} (x) = y

$\log_{b} (x) = y$ is equivalent to

b^{y} = x

$b^{y} = x$ .

10^{x} = 100

$10^{x} = 100$

Step 3

Create equivalent expressions in the equation that all have equal bases.

10^{x} = 10^{2}

$10^{x} = 10^{2}$

Step 4

Since the bases are the same, the two expressions are only equal if the exponents are also equal.

x = 2

$x = 2$

Step 5

The variable

x

$x$ is equal to

2

$2$ .

2

$2$

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