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6-12=-6×-15=90
karena min × min =plus
3x2 - 12x - 15 = 0
Kita bagi 3 semuanya
x^2 - 4x - 5 = 0
( x - 5 ) ( x + 1 ) = 0
x = 5 x = -1
HP = ( -1, 5 )