The logarithm of a quotient is equal to the logarithm of the numerator minus the logarithm of the denominator
Decompose $4$ in it's prime factors
Using the power rule of logarithms: $\log_a(x^n)=n\cdot\log_a(x)$
Using the power rule of logarithms: $\log_a(x^n)=n\cdot\log_a(x)$
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