Question

If x + y + z is equal to 9 and xy + y z + z x is equal to 40 find x square + y square + z square

Answer 1

$\huge{\bold{\purple{Hlo}}}$

here is ur solution..

( x + y + z )² = x² + y² + z² + 2xy + 2yz + 2zx

putting given values..

( 9 )² = x² + y² + z² + 2 ( 40 )

81 = x² + y² + z² = 80

81 - 80 = x² + y² + z²

1 = x² + y² + z²

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x² + y² + z² = 1 ✔✔



hope it helps..