Question
Solve:
$a^2-b^2+a-b$
$a^2-b^2+a-b$
✓
Answer
$a^2-b^2+a-b$
$=(a+b)(a-b)+(a-b)$
$=(a-b)(a+b+1)$
$=(a+b)(a-b)+(a-b)$
$=(a-b)(a+b+1)$
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