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If x= b + c - 2a , y = c + a - 2 b , z ...

If ` x= b + c - 2a , y = c + a - 2 b , z = a + b -2 c ` then the value of ` x^(2) + y^(2) - z^(2) + 2xy ` is

A

0

B

`a+b+c`

C

`a-b+c`

D

`a+b-c`

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The correct Answer is:
A
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LUCENT PUBLICATION-ALGEBRAIC IDENTITIES -Exercise - 1A
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  11. IF (a )/( 1 - a) + (b)/( 1 - b) + (c)/(1 - c) = 1 then the value of ...

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  14. If (x^(3) +3x)/(3x^(2)+1)=(189)/(61) then value of x is

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  19. If b+c = 2x, c+a =2y and a +b =2z then value of a^(3) +b^(3) +c^(3) i...

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