Question
Simplify :
(a + b)³ – a³ – b³
✓
Answer
(a + b)³ – a³ – b³
= a³ + 3a²b + 3ab² + b³ – a³ – b³
= 3a²b + 3ab²
= a³ + 3a²b + 3ab² + b³ – a³ – b³
= 3a²b + 3ab²
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