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y= x+2
disubtitusikan menjadi
x^2-x-2=0
(x-2)(x+1)=0
x=2 x=-1
hp{2,-1}
y = x + 2
x^2 = x+2
x^2 - x - 2 =0
(x - 2)(x+1) = 0
x= 2 atau x = -1