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2x^2 + 2x -4 = 0
x^2 + x -2 = 0
(x+2)(x-1) = 0
x +2 = 0
x = -2
atau
x - 1 = 0
x = 1
unt x = -2
y = x^2 -x + 2
y = (-2)^2 + 2 + 2
= 8
unt x = 1
y = x^2 -x +2
= (1)^2 - 1 + 2
= 2
hp = {(-2,8),(1,2)}