Simplify by using formula :(x + y - 3) (x + y + 3) - Vidyadip

Question

Simplify by using formula $:(x + y - 3) (x + y + 3)$

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Answer

$(x + y - 3) (x + y + 3)$
$= (x + y)^2 - (3)^2$
$= x^2 + y^2 + 2xy - 9$
$($Using identity : $(a + b)(a - b) = a^2 - b^2).$

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