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y=x²+x-2
4=x²+x-2
=x²+x-6
(x-2)(x+3)
x=2 x=-3
untuk x=2
mencari nilai m=y'=2x+1=5
y-y1=m(x-x1)
y-4=5(x-2)
y=5x-10+4=5x-6
untuk x=-3
m=y'=2x+1=-5
y-y1=m(x-x1)
y-4=-5(x+3)
y=-5x-15+4=-5x-11
=5x+11