1.

यदि `x^(2)+y^(2)+6x+5=4(x-y)` हो तो `x-y` क्या होगा?A. 1B. -1C. 0D. 4

Answer» Correct Answer - A
`x^(2)+y^(2) +6x+5=4(x-y)`
`x^(2)+y^(2)+6x+5-4x+4y=0`
`x^(2)+2x+1+y^(2)+4y+4=0`
`x^(2)+2x+1+y^(2)+4y+4=0`
`(x+1)^(2)+(y+2)^(2)=0`
`0 , 0`
`x+1=0`
`x=-1`
`y+2=0`
`y=-2`
`(x-y=-1-(-2)=-1+2=1`


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