Question

Calcule :............

Answer 1

$a) \\ \log_216=x \\ \\ 2^x=16 \\ \\ 2^x=2^4 \\ \\ x=4 \\ \\ b) \\ \\ \log_7 \frac{1}{49} =x \\ \\ 7^x= \frac{1}{49} \\ \\ 7^x= \frac{1}{7^2} \\ \\ 7^x=7^{-2} \\ \\ x=-2$