1.

X+y+z=9and xy+yz+zx=26 to x²+ y²+z²= ?

Answer»

Heya..........!!!

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This question can be easily solved by applying the identity :

=> ( X + y + z )² = x² + y² + z² + 2 ( xy + yz + ZX )


Given in the question :

--» x + y + z = 9
--» xy + yz + zx = 26


=> ( 9 )² = x² + y² + z² + 2 ( 26 )

=> 81 = x² + y² + z² + 52

=> x² + y² + z² = 81 - 52



♦ 29. is the required ANSWER .



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