In economies, the Revenue (R) generated by selling x units at a price p dollars per unit is given by

Example 5 In economics, the Revenue (R) generated by selling x units at a price p dollars per unit is given by R = x . p(x) p = price per unit x = number of units p(x) is the demand function: P(x) = - 7x+40 1 Find an equation expressing R in terms of x. Question: How would you find the maximum revenue in this case