Question

Factorise 1-x2-y2-2xy

Answer 1

Answer:

this is the correct answer

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Answer 2

${\huge{\bold{\purple{\bigstar{\boxed{\boxed{\bf{Question}}}}}}}}$

$1 - x^2 - y^2 - 2xy$

${\huge{\bold{\purple{\bigstar{\boxed{\boxed{\bf{Soluti0n}}}}}}}}$

$\sf\implies 1 - x^2 - y^2 - 2xy$

$\sf\implies1 - (x^2 + y^2 +2xy)$

${\bold{\blue{\boxed{\bf{a^2 + b^2 +2ab = (a+b)^2}}}}}$

$\sf\implies1^2 - (x+y)^2$

${\bold{\blue{\boxed{\bf{a^2 - b^2 = (a+b)(a-b) }}}}}$

$\sf\implies(1+x+y)(1-x-y)$

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