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Finding Square of a Number Using Identity

Question 5bAd...

Question

Question 5(b)
Add : 2x (z - x - y ) and 2y (z - y - x)

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Solution

$2 x (z - x - y) + 2 y (z - y - x) = 2 x z - 2 x^{2} - 2 x y + 2 y z - 2 y^{2} - 2 x y$
$= 2 x z - 2 x y - 2 x y + 2 y z - 2 x^{2} - 2 y^{2}$
$= - 2 x^{2} - 2 y^{2} - 4 x y + 2 y z + 2 z x$

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Finding Square of a Number Using Identity

Standard VIII Mathematics

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