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f(x)=y= x²+2x-8
(x -2) (x+4)= 0
x= 2, x= -4
x=2, maka y = (2)²+ 2(2) - 8 = 0 maka (2,0)
x=-4, maka y = (-4)²+ 2(-4) -8= 0 maka ( -4, 0)
buat lh grafiknya