>>11561020you can multiply out the brackets which would produce a quadratic, find the derivative of the quadratic and find at which x value it is equal to 0. this will give you the maximum as the x^2 term in the function is negative. (you are finding the point where, approximately, the function does not increase or decrease for every increase in x, you are finding where the slope is 0 or where it levels off, which so happens to be the maximum of that function) also, can any economics anons explain to me how that function is derived