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If : a^2+b^2+c^2-a b-b c-c a=0 , prove t...

If : `a^2+b^2+c^2-a b-b c-c a=0` , prove that `a=b=c`

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RD SHARMA ENGLISH-ALGEBRAIC IDENTITIES-All Questions
  1. If 4x^2+y^2=40\ and x y=6 , find the value of 2x+y

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  2. Prove that: 2a^2+2b^2+2c^2-2a b-2b c-2c a=[(a-b)^2+(b-c)^2+(c-a)^2]

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  3. If : a^2+b^2+c^2-a b-b c-c a=0 , prove that a=b=c

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  4. Evaluate each of the following using identities: (i)(2x-1/x)^2 (ii...

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  5. Evaluate each of the following using identities: (i)(a^2b-b^2a)^2 ...

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  6. Evaluate each of the following using identities: (1. 5 x^2-0. 3 y^2)\...

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  7. Evaluate each of the following using identities: (i)(399)^2(ii) (0. 98...

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  8. Evaluate each of the following using identities: (i)991\ xx\ 1009 (ii)...

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  9. Simplify each of the following: 175\ xx\ 175+2\ xx\ 175\ xx\ 25+25\ xx...

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  10. Simplify each of the following: 322\ xx\ 322-2\ xx\ 322\ xx\ 22+22\ xx...

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  11. Simplify each of the following: 0. 76\ xx\ 0. 76+2\xx\ 0. 76\ xx\ 0. 2...

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  12. Simplify each of the following: (7. 83\ xx\ 7. 83-1. 17\ xx\ 1. 17)/(6...

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  13. If x+1/x=11 , find the value of x^2+1/(x^2)

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  14. If x-1/x=\ -1, find the value of x^2+1/(x^2)

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  15. If x+1/x=sqrt(5) , find the values of x^2+1/(x^2) and x^4+1/(x^4)

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  16. If x^2+1/(x^2)=66 , find the value of x-1/x

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  17. If x^2+1/(x^2)=79 , find the value of x+1/x

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  18. If 9x^2+25 y^2=181\ \ a n d\ x y\ =\ -6, find the value of 3x+5y

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  19. If 2x+3y=8 and x y=2 , find the value of 4x^2+9y^2

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  20. If 3x-7y=10\ and x y=-1, find the value of 9x^2+49 y^2

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