# Finding critical values of hard functions

1. Mar 6, 2013

### hannazahhh

1. The problem statement, all variables and given/known data

2. Relevant equations
I found the derivative of the equation is sqrt(3/2) x-3/8 (10-3 x) and ive checked this over many times so im pretty confident in my answer.

3. The attempt at a solution Im sure what to do with the √2 and the 8 on the bottom. I did it with disregarding them and I now that's wrong but it cam up with the closet answer. I got it to the point of x+9x=30/√3 I get lost after that and im pretty sure my work before this point is wrong also.
1. The problem statement, all variables and given/known data

im just trying to find the smallest area a square and triangle with perimeter some of 10 can be.

Last edited: Mar 6, 2013
2. Mar 6, 2013

### Ray Vickson

I don't see an equation anywhere; an equation must have an '=' sign in it. Do you mean that you want to solve
$$\sqrt\frac{3}{2}\: x - \frac{3}{8} (10 - 3x) = 0?$$
If so, that is just elementary algebra.