If x^2 + y^2 + 2x - 4y + 5 = 0, then find out the value of x + y.
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x²+y²+2x-4y+5=0
x²+y²+2x-4y= -5
(x+y)²=x²+y²+2xy
(x+y)²-2xy=x²+y²
put value of x²+y²
(x+y)²-2xy+2x-4y= -5
(x+y)²=2(xy+x-2y)-5
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