Question

8 elevado a x menos 4 igual a 4 elevado a x mais 1

Answer 1

$8^{x-4} = 4^{x+1}   ===> (2^3)^{x-4} = (2^2)^{x+1}   ===> 2^{3x-12} = 2^{2x+2}$

Cortando as bases temos que:

3x-12 = 2x + 2

x = 14