Question
Factorise $: a^2- b^2- (a + b)^2$
✓
Answer
$a^2- b^2- (a + b)^2$
$= a^2 - b^2 - ( a^2 + 2ab + b^2 )$
$= a^2 - b^2 - a^2 - 2ab - b^2$
$= - 2ab - 2b^2$
$= - 2b( a + b )$
$= a^2 - b^2 - ( a^2 + 2ab + b^2 )$
$= a^2 - b^2 - a^2 - 2ab - b^2$
$= - 2ab - 2b^2$
$= - 2b( a + b )$
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