Himpunan penyelesaian dri 2 log x = log 3+log (x+6)=

2log x = log 3+ log (x+6)
log x^2 =log (3)(x+6)
x^2=3x + 18
x^3-3x-18=0
(x-6)(x+3)=0
x=6 x=-3
jadi hp={6,-3}