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Learn Precalculus Exponentials and logarithms

Solve exponential and log equations

Rewrite the equation, then check that the answer works.

Precalculus: Exponentials and logarithms

Work through it

$2^{x} = 16$

$16 = 2^{4}$

$x = 4$

$lo g_{2} (x + 1) = 3$

$x + 1 = 2^{3}$

$x = 7$

Watch out for this

Keeping an answer that makes a log undefined.

You can only take the log of a positive number, so check each answer.

Your turn

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