Factorise by grouping method :
5. a3 + a - 3a2 – 3
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Answer:
=(a 2 +1)(a−3)
Step-by-step explanation:
a 3 +a−3a 2−3
=a(a 2 +1)−3(a 2 +1)
=(a 2 +1)(a−3)
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