Question

Tentukan nilai x dari 2 log x + 2log(x-2) = 3

Answer 1

2 log x + 2 log (x-2) = 3
=> 2 log x(x-2) = 2 log 8
=> 2 log x^2-2x = 2 log 8
=> x^2-2x = 8
=> x^2-2x-8 = 0
=> (x+2)(x-4)
X1 = -2
X2 = 4