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Question

Simplify a(a2+a+1)+1 and find its value for a=1

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Solution

a(a2+a+1)+1
=a3+a2+a+1
=a2(a+1)+1(a+1)
=(a2+1)(a+1) at a=1
=(1+1)(1+1)
=2×2=4

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