Question

Responder:

2^-¹ + 2^-²+= 36

Answer 1

2ˣ⁻¹ + 2ˣ⁺² = 36 
2ˣ⁻¹ = 2ˣ / 2¹ 
2ˣ⁺² = 2ˣ * 2²
( 2ˣ /2¹ ) +  ( 2ˣ * 2² )  =  36
fazendo 2ˣ  = y
y/2 + 4y/1 = 36/1
mmc = 2
y +8y = 72
9y = 72
y = 72/9 = 8 
2ˣ = 8 ou  2³ 
x = 3 ****
PROVA
2³⁻¹ +  2 ³⁺² = 36
2²  + 2⁵  = 36
4 + 32 = 36
36 = 36  CONFERE