Application of factoring? ? ? ?

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An open top box is made by cutting the corners out of a 50cm by 40cm piece of cardboard.

This results in the equation for volume : (50 - 2x)(40 - 2x)x

Determine the length of the sides of each square that must be cut that will result in a box with maximum volume.

Answer: 7.4

In full detail please explain how one would come to this answer, thank you.
 
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