Question

²log x + ²log (x-2) = 3
hp dari persamaan tersebut adalah ......

Answer 1

²log x + ²log (x-2) =  3
= ²log (x)(x-2) = 3
= ²log x²-2x = 3
= x²-2x-3 = 0
= (x-3)(x+1)

pembuktian
x-3 = 0
x = 3
⇒ (x) = 3
    (x)-2 = 3-2=1

x+1 = 0
x = -1
⇒ (x) = -1
    (x)-2= -1-2=-3

HP (3)