A(t)=t^5-5t^4+20t^3-17 I am having trouble setting the derivative equal to zero. Please help!

A(t)=t^5-5t^4+20t^3-17 I am having trouble setting the derivative equal to zero. Please help!

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What did you get for the derivative?

I've got
\[A' = 5t^4-20t^3 + 60t^2 = 5t^2(t^2-4t + 12)\]

THat's exactly what I've got

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