1.

यदिम `x=b+c-2a, y=c+a-2b,z=a+b-2c` है तो `x^(2)+y^(2)-z^(2)+2xy` का मान क्या होगा?

Answer» Correct Answer - A
`x-b+c-2a`
`y=c+a-2b`
`z=a+b-2c`
`impliesx+y+z=(b+c-2a)+`
`(c=a-2b)+(a+b-2c)=0`
`:.` Now
`= x^(2)+y^(2)+2xy-z^(2)`
`=(x+y)^(2)-z^(2)(A^(2)-B)^(2)=(A+B)(A-B)`
`(x+y-z)(x+y+z)=0`
`:. x^(2)+y^(2)-z^(2)+2xy=0 xx (x+y-z)=0`


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