Question

Questão de logaritmo

Answer 1

A) E = 3 + 0 + 5 = 8
B) 3 = x + 3/ x - 1
3x - 3 = x + 3
2x = 6
x = 3
C) (2^x)² - 2^x*12 + 32 = 0 2^x = t
t² - 12t + 32 = 0
∆ = 144 - 4*32*1 2^x = 8 2^x = 4
∆ = 144 - 128 2^x = 2³ 2^x = 2²
∆ = 16 x = 3 x = 2
12 ± 4/2
t = 8
ou
t = 4