Jika 4^(x +2) + 7 dikali 2^(x + 4) = 128. Maka, 2^(x +1) adalah... Mohon dijawab iya.....terimakasihh ( ´ ▽ ` )ﾉ

jawab

4ˣ⁺² + 7.2ˣ⁺⁴ = 128

(2)²ˣ⁺⁴ + 7 .(2)ˣ⁺⁴ = 128

(2ˣ)².  2⁴ +  7. 2⁴ .(2)ˣ  - 2⁷= 0...bagi 2⁴ 

(2ˣ)² + 7 (2ˣ) - 2³ = 0

misal 2ˣ = a -->. x = ²log a

a² + 7a - 8 =  0
(a  + 8)(a - 1) =0
a = - 8 (TM)  atau a = 1

a = 1 --> x = ²log 1 
x= 0

nilai 2^(x + 1)= 2^(0 +1) = 2^1 = 2