Help applied probem - max & min

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1. A drug that stimulates reproduction is introduced into a colony of bacteria. After t minutes, the number of bacteria is given approximately by N() = 1500 + 12t^2 - t^3, 0≤t≤50 At what value of t is the number of bacteria maximal?



2. Possible answers

a. 10min b. 9min c.8min d.0min


provide steps please :D

thnx!
 
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Differentiatr N(t), set it equal to zero and find trhe value of t.
 
And even if you didn't know how to do what hunt_mat suggested you could simply plug in the values and compare what you get...
 
thanx!
 
There are two things I don't understand about this problem. First, when finding the nth root of a number, there should in theory be n solutions. However, the formula produces n+1 roots. Here is how. The first root is simply ##\left(r\right)^{\left(\frac{1}{n}\right)}##. Then you multiply this first root by n additional expressions given by the formula, as you go through k=0,1,...n-1. So you end up with n+1 roots, which cannot be correct. Let me illustrate what I mean. For this...
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