1.

यदि `x^(2)+y^(2)-4x+8=0` है तो `x-y` का मान क्या होगा?A. 4B. -4C. 0D. 8

Answer» Correct Answer - C
`x^(2)+y^(2)-4x-4y+8=0`
`x^(2)+4-4x+y^(2)+4-4y=0`
`(x-2)^(2)+(y-2)^(2)=0`
`x-2=0, y-2=0`
`x=2, y=2`
`:. x-y=2-2=0`


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