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x²+2x-2x-4-(x²-4x+4)=-y
- y=x²+2x-2x-4-x²+4x-4
-y=4x-8
y=-4x+8
(xkwadrat+2x-2x-4)-(xkwadrat+4)=-y
(xkwadrat-4)-(xkwadrat+4)=-y
-y=0
y=0
x²+2x-2x-4-x²-2x-2x+4=-y
(skrócenie)
-4x = -y
y = 4x