A store owner estimates that by charging x dollars each for a certain brand of sunglasses, he can sell 40 2 pairs of sunglasses each week. The quadratic function R(x) = –22 + 40x is used to find the revenue, R, received when the
selling price of a pair of sunglasses is x. Find the selling price that will give him the maximum revenue, and then find the
amount of the maximum revenue.

Astudent solves the equation for v. start with the original equation. use the square root property. use the division property of equality. use the multiplication property of equality. simplify. which statement explains how to correct the error that was made? the square root property must be applied after all other properties of equality are applied. the multiplication property of equality should have been applied before the division property of equality. the division property of equality should have been applied to move the fraction to the other side of the equation. the square root property should have been applied to both complete sides of the equation instead of to select variables.