Question

A box that holds an expensive pen has square ends, and its length is 13 cm longer than its width. The volume of the box is 60 cm^3. Determine the dimensions of the box.

Answer 1

60 = w^2 (w+13)

w^3 + 13 w^2 + 0 w - 60 = 0

try w = 2

Answer 2

I got that from
http://www.mathportal.org/calculators/polynomials-solvers/polynomial-roots-calculator.php

the other two roots do not work for you (negative)