Applying x^2+bx+c to real life questions

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Now Playing:Applications of factoring polynomials – Example 1a

Factoring Word Problems
1. The volume of a rectangular prism is $(k^3+7k^2+12k)$ $m^3$ . Find the dimensions in terms of k.
2. A sheet of cardboard is 5 m by 7 m and has squares x m wide cut from each corner.
  The sides are folded up to become an open-top box.
  Find the volume of the box in a factored form.