SOLUTION: Factor completely: a^4-1 I got the answer (a^2+1)(a+1)(a-1) but I don't know how Please show me step by step to get the answer. thanks

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Question 451705: Factor completely: a^4-1
I got the answer (a^2+1)(a+1)(a-1) but I don't know how
Please show me step by step to get the answer. thanks

Answer by jorel1380(3719)   (Show Source): You can put this solution on YOUR website!
a4-1=(a2+1)(a2-1)
""=(a2+1)(a+1)(a-1)..

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