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m²-6m-27=0
m²-6m=27
(m-3)²-9=27 ====>3 dari 6/2 dan 9 dari (6/2)²
(m-3)²=27+9
(m-3)²=36
m-3=±6
m=3+6=9 atau m=3-6=-3
(m-9)(m+3)
m=9 dan m=-3