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= 2x2 - 6x - 20
= 2x2 +4x - 10x - 20
= (2x2+4x)- (10x + 20 )
= 2x(x + 2) - 10(x+2)
= (x+2) (2x-10) = 0
melengkapkan kuadrat sempurna
= 2x2 - 6x - 20
x2 - 3x - 10 = 0
x2 - 3x = 10
(2x²+4x) + (-10x-20)
2x(x+2) - 10(x+2)
(2x-10)(x+2)
melengkapi kuadrat sempurna
HP = {5 , -2}