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²log²x - 6 ²log x = ²log 1 - 8
²log²x - 6 ²log x = 0-8
²log²x - 6 ²log x = -8
misal ²log x = a
a²-6a = -8
a²-6a+8 = 0
(a-4)(a-2) = 0
a-4=0 atau a-2=0
a=4 atau a=2
untuk a=4
²log x = 4
x = 2⁴
x = 16
x₁ = 16
untuk a=2
²log x = 2
x = 2²
x = 4
x₂ = 4
x₁+x₂ = 16+4
= 20