>>12001486Here's how to do it.
You know what is, right? It's some positive number.
Look at the change in the slope of the function around . See how it goes from being positive to negative? That tells us that . After all, to go from positive to negative, you need to cross 0.
Finally, graph around 5, and consider it's derivative. You should notice it's roughly a constant negative, which makes sense locally around 5, as the derivative of is decreasing.
Thus, the answer is
.
I strongly suspect this is a homework question. Try
>>>/wsr/ next time. Better yet, learn how to solve problems like this on your own: this is basic stuff, and weak foundations are the mortal enemy of calculus students.
