Thank you in advance for your help.
I have found the derivative of f(x) from a previous problem, and now I must set the derivative to 0 since I am now finding the function of x values where the tangent is horizontal, meaning that the slope is 0.
Here is where I am in the problem:
in an attempt to move x to one side and numbers to the other:
But how do I get rid of the two x's since there is only supposed to be one x on the left side?
Sorry, I'm stuck!