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(x+10)(x-2) = 0
x1=-10 atau x2=2
nilai 4x1 + 5x2 = 4(-10) + 5(2) = -40 + 10 = -30
(x-2)(x+10)=0
maka
x-2=0 x+10=0
x2=2 x1=-10
4x1 + 5x2 = 4.(-10) + 5.2
= -40+10 =-30