Question
Factorise:
a3 + a - 3a2 - 3
a3 + a - 3a2 - 3
✓
Answer
a3 + a - 3a2 - 3
= a(a2 + 1) - 3(a2 + 1)
= (a - 3)(a2 + 1)
= a(a2 + 1) - 3(a2 + 1)
= (a - 3)(a2 + 1)
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