The length of a piece of cardboard is two inches more than its width. an open box is formed by cutting out 4 inch squares from each corner and folding the sides. If the volume of the box is 672 cubic inches, find the dimensions.
Math - Graham, Saturday, September 7, 2013 at 12:23am
Volume of rectangular prism
672 = 4*w*(w+2)
w^2 + 2w - 168 = 0
Solve for w, using quadratic formula
w = (-b ± √(b^2-4ac))/(2a),
a = 1, b = 2, c = -168