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y = x²-3x+2
pembahasan :
y = x-1 disubstitusikan ke :
y = x²-3x+2
x-1 = x²-3x+2
x²-3x-x+2+1 = 0
x²-4x+3 = 0
(x-1)(x-3) = 0
x-1 = 0 atau x-3 = 0
x = 1 x = 3
jadi, himp.pnyelesaiannya {1 atau 3}