What's The Biggest Box That Can Be Cut From This Cardboard?

Calculus Level 2

At Sandy's Candies, for a fixed price, you can purchase a square sheet of cardboard 30 cm by 30 cm. This cardboard can then be made into a box, by cutting equal squares from all four corners and folding up the flaps. You may then take as many chocolates as will fit in the box.

What is the side length (in cm) of the squares you should cut from the corners to make a box that will hold the most chocolates?

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