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4^{-p+3}=16
Use the rules of exponents and logarithms to solve the equation.
\log(4^{-p+3})=\log(16)
Take the logarithm of both sides of the equation.
\left(-p+3\right)\log(4)=\log(16)
The logarithm of a number raised to a power is the power times the logarithm of the number.
-p+3=\frac{\log(16)}{\log(4)}
Divide both sides by \log(4).
-p+3=\log_{4}\left(16\right)
By the change-of-base formula \frac{\log(a)}{\log(b)}=\log_{b}\left(a\right).
-p=2-3
Subtract 3 from both sides of the equation.
p=-\frac{1}{-1}
Divide both sides by -1.