Question

Determine o conjunto soluçao da equaçao:

3^2+log5 x = 81

Answer 1

.
$3^{2+\log_5x}=81 \\ \\ \not3^{2+\log_5x}=\not3^4 \\ \\ 2+\log_5x=4 \\ \\ \log_5 x=4-2 \\ \\ \log_5 x=2 \\ \\ x=5^2 \\ \\ x=25$