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[tex] s(t) = 1/2t^3-5t^2+3t+6 [/tex]

I'm trying to find all values of t where s(t) = -30

My first thought is to solve for 0 hence:

[tex] 1/2t^3-5t^2+3t+36=0 [/tex]

I know the answers are t=4 and t=8.196 but I can't get to it...I'm assuming I need to factor this down but I'm can't see it. Any help/hints would be most appreciated as I've been banging my head against a brick wall for some time now...

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# Factoring problem that has me stumped!

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