SOLUTION: how is this problem factored? a^4-3a^3+40a^2

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Question 209407: how is this problem factored?
a^4-3a^3+40a^2
Answer by Earlsdon(6294) About Me  (Show Source):
You can put this solution on YOUR website!
Factor:
a%5E4-3a%5E3%2B40a%5E2 Notice that each term contains a factor of a%5E2
%28a%5E2%29%2A%28a%5E2%29-3%2Aa%2A%28a%5E2%29%2B40%2A%28a%5E2%29 Factor out the a%5E2
highlight%28a%5E2%28a%5E2-3a%2B40%29%29...and that's as far as we can go for factoring.