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- Thread starter Bushy
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- Thread starter
- #1

- Aug 18, 2013

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- Mar 5, 2012

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Hi Bushy!Consider the function

f(x) = (x+4)^2(a-x)

Let T be greater than 0, find 'a' such that f(x) = T has 2 solutions.

No idea how to kick this one off..

A 3rd order polynomial has only 2 solutions if one of the 2 is a duplicate solution, meaning it has an extreme value there.

To find an extreme value you're supposed to take the derivative...