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²log (x+8) (x+1) - ²log (x+56) = ²log 2 pangkat 0
²log x² + 9x + 8 - ²log (x+56) = ²log 2 pangkat 0
²log x³+9+ 1/7 = ²log 2 pankat 0
x² + 64/7 = 1
7x² + 64 = 7
7x² + 57 = 0
7x² = -57
x² = -57/7
x = √-57/7 kalo ga salah
² log ( ( (x+8)·(x+1) ) / (x+56) ) = 0
² log ( (x²+9x+8) / (x+56) )= 0
x²+9x+8/x+56 =2⁰
x²+9x+8 = x+56
x²+9x-x+8-56 = 0
x²+8x-48 = 0
(x+12) (x-4) = 0
x = -12 atau x = 4
himpunan penyelesaian = (x=-12 atau x=4 )