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y=x^2-2x
x^2-2x=4x-8
x^2-2x-4x+8=0
x^2-6x+8=0
(x-2)(x-4)=0
x:2 x:4
2.y=x^2-8x+15
y=x-5
x-5=x^2-8x+15
x^2-8x+15-x+5=0
x^2-9x+20=0
(x-4)(x-5)=0
x:4 x:5
3.y=2x-9
y=x^2-4x
x^2-4x=2x-9
x^2-4x-2x+9=0
x^2-6x+9=0
(x-3)(x-3)=0
x:3 x:3
maaf jika ada yang salah