Suppose that the consumer expenditure E (in dollars) depends on the market price p per unit (in

Question:

Suppose that the consumer expenditure E (in dollars) depends on the market price p per unit (in dollars) according to
E = 10,000p - 100p2
(a) Graph this equation with a graphing calculator and the window p-min = -50, p-max = 150; E-min = - 50,000, E-max = 300,000.
(b) Because E represents consumer expenditure, only values of E ( 0 have meaning. For what p-values is E ( 0?