A gutter with an open top is to be made by bending up the edges of a 16 inch wide piece of aluminum at right?

angles. write an expression in x for the width of the bottom of the gutter. Ok I came up with w= 16-2x. now i need to find an expression for the area of the cross section of the gutter and write it in ax^2 + bx +c. would this be correct : A = LW so A= 2x(16-2x) 32x-4x^2 +0 correct form -4x^2 +32x +0 Help!