X-4x + 2Y + 2Y + 9 / 2 = 0, find XY

X-4x + 2Y + 2Y + 9 / 2 = 0, find XY

x²-4x+2y²+2y+9/2=0
(x²-4x+4)+2(y²+y+1/4)=0
(x-2)²+2(y+1/2)²=0
x-2=0,y+1/2=0
x=2,y=-1/2
∴xy
=2×(-1/2)
=-1
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