Question

Tentukan nilai x dari ⁷log(x+1)+ ⁷log(x-5)=1.

Answer 1

7 log(x+1)(x-5) = 7 log 7 
(x+1)(x-5) = 7
x^2 + x - 5x - 5 = 7
x^2 - 4x - 12 = 0
(x-6)(x+2)
x = 6 atau x = -2

Answer 2

^7log (x+1)(x-5) = ^7log 7
(x+1)(x-5)=7
x^2-4x-5-7=0
x^2-4x-12=0
(x-6)(x+2)=0
x-6=0 x= 6
x+2= 0 x =-2