### Home > A2C > Chapter 4 > Lesson 4.3.2 > Problem 4-150

4-150.

The amount of profit (in millions) made by Scandal Math, a company that writes math problems based on tabloid articles, can be found by the equation , where

*n*is the number of textbooks sold (also in millions). Find the maximum profit and the number of textbooks that Scandal Math must sell to attain this maximum profit.

To find the maximum, you need to find the vertex of the parabola. Write the equation in graphing form so you can find the vertex.

It is easier to complete the square without the

Do not forget to multiply again by

The vertex is your maximum *y*-value.