X²+8x-20=0 tentukan dengan cara memfaktorkan

X^2 + 8x – 20 =
x^2 + 10x – 2x – 20 =
(x^2 + 10x) – (2x + 20) =
x (x + 10) – 2 (x + 10) =
(x – 2) (x + 10)

x – 2 =0
x = 2

x + 10 =0
x = -10

HP = { 2 , -10 }