Question

2^x+2^x-1 : 12 - Função exponencial

Answer 1

Olá Yasmin 

2^(x+2) + 2^(x-1) = 12

4*2^x + 2^x/2 = 12

8*2^x + 2^x = 24 

9*2^x = 24 

2^x = 24/9 = 8/3 

xlog(2) = log(8) - log(3)

x = (log(8) - log(3))/log(2) = 1.415

.