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faktor:
(x-x1)(x-x2) = 0
(x-5)(x+8) = 0
x²+3x-40 = 0
jumlah n perkalian akar:
ingat: x1+x2 = -b/a, dan x1.x2 = c/a
maka:
x²-(x1+x2)x+(x1.x2) = 0
x²-(5-8)x+(5.(-8)) = 0
x²+3x-40 = 0