Question
Solve:
$a^2+2 a b+b^2-16$
$a^2+2 a b+b^2-16$
✓
Answer
$a^2+2 a b+b^2-16$
$=a^2+2 \times a \times b+b^2-16$
$=(a+b)^2-4^2$
$=(a+b-4)(a+b+4)$
$=a^2+2 \times a \times b+b^2-16$
$=(a+b)^2-4^2$
$=(a+b-4)(a+b+4)$
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