Can someone please help me solve this question?

Find the least value ofv+6400/vin the domain v>0.

I have no idea....

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- Jun 7th 2009, 04:27 PM #1

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- Jun 7th 2009, 04:34 PM #2

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Whoever gave you this problem clearly expects you to know that a maximum or minimum for a differentiable function occurs where the derivative is 0. If f(v)= v+ (6400/v), then $\displaystyle f'(v)= 1- (6400/v^2)$. Set that equal to 0, solve for v, and find f(v) for that vaue of v.