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x² -4=0 ......... x=2 (kuadran 1 dan 4)
atau x= -2 (kuadran 2 dan 3)
x= -2 shg y= 2-1=1 ..A(-2,1)
titik melalui A(-2,1) dan P(2,1), maka garis g=
(y-1)=(1-1)/(2+2)[x-1)
y-1=0 ... y=1 jagi garis g:: y=1
P(2,1)