Hi, log4(x-6)+log4(x-6)=3 ( x-6)(x-6)= 64 x^2 - 12x + 36 = 64 x^2 - 12x - 28 = 0 (x-14)(x+2) = 0 |(Tossing out x= -2 as (x-6)must be > 0 CHECKING our answer***