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7-9.

Margee thinks she can use logs to solve 56 = x8, since logs seem to make exponents disappear. Unfortunately, Margee is wrong. Explain the difference between equations like 2 = 1.04x, in which you can use logs, and 56 = x8, in which it does not make sense to use logs. Homework Help ✎

Look at where the variable is in each equation.

Logarithms are used to solve equations where the variable is the exponent.
Roots (or raising to a fractional exponent) are used to solve equations where the exponent is known and the variable is the base.