Question
Factorise:
$25-a^2-b^2-2 a b$
$25-a^2-b^2-2 a b$
✓
Answer
$25-a^2-b^2-2 a b$
$=25-\left(a^2+b^2+2 a b\right)$
$=(5)^2-(a+b)^2$
$=(5+a+b)(5-a-b)$
$=25-\left(a^2+b^2+2 a b\right)$
$=(5)^2-(a+b)^2$
$=(5+a+b)(5-a-b)$
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