Question

Hasil kali akar-akar 2^x+ 32/2^x -12=0 adalah...

Answer 1

2^x + 32/2^x - 12 = 0
misal: 2^x = a
a + 32/a - 12 = 0
a² - 12a + 32 = 0
(a - 4)(a - 8) = 0
a = 4 atau a = 8

2^x = 4
x = 2

2^x = 8
x = 3

maka 2 x 3 = 6