Because our calculators have keys for logarithms base 10 and base e, we will rewrite the Change-of-Base Formula with the new base as 10 or e. This can be any base b we want where b > 0, b ≠ 1. The Change-of-Base Formula introduces a new base b. y = log b M log b a Substitute y = log a M. log b a y = log b M Use the Power Property. y = log a M Rewrite the expression in exponential form. ![]() log a M = log b M log b a Suppose we want to evaluate log a M. To evaluate a logarithm with any other base, we can use the Change-of-Base Formula. Use the Properties of Logarithms to condense the logarithm 2 log x + 2 log ( x + 1 ) 2 log x + 2 log ( x + 1 ). 1 4 ( 3 log 2 x − log 2 3 − 2 log 2 y − log 2 z ) log 2 x 3 3 y 2 z 4 = 1 4 ( 3 log 2 x − log 2 3 − 2 log 2 y − log 2 z ) 1 4 ( 3 log 2 x − ( log 2 3 + 2 log 2 y + log 2 z ) ) Simplify by distributing. 1 4 ( log 2 ( x 3 ) − ( log 2 3 + log 2 y 2 + log 2 z ) ) Use the Power Property, log a M p = p log a M, inside the parentheses. N = log a M + log a N, in the second term.1 4 log 2 ( x 3 3 y 2 z ) Use the Quotient Property, log a M log 2 ( x 3 3 y 2 z ) 1 4 Use the Power Property, log a M p = p log a M. 1 4 ( 3 log 2 x − log 2 3 − 2 log 2 y − log 2 z ) log 2 x 3 3 y 2 z 4 = 1 4 ( 3 log 2 x − log 2 3 − 2 log 2 y − log 2 z ) log 2 x 3 3 y 2 z 4 Rewrite the radical with a rational exponent. 1 4 ( log 2 ( x 3 ) − log 2 ( 3 y 2 z ) ) Use the Product Property, log a M Log 2 x 3 3 y 2 z 4 Rewrite the radical with a rational exponent.
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