Question

Tolong isi dengan caranya yaa

Answer 1

27^x - 3^(2 - 3x) - 8 = 0
=> 3^3x - 3^2/(3^3x) - 8 = 0
misal 3^3x = a
=> a - 9/a - 8 = 0 ...... kali a
=> a^2 - 9 - 8a = 0
=> a^2 - 8a - 9 = 0
=> (a + 1)(a - 9) = 0
=> a = -1 atau a = 9
a = -1 => 3^3x = -1 => tak ada x yang memenuhi
a = 9 => 3^3x = 3^2 => 3x = 2 => x = 2/3