An open box is made from a square piece of cardboard 30 inches wide by removing a square of side x from each corner and turning up the sides. Find the possible values of x if the box is to have a volume of 2000 cubic inches.
here you go IMG_0842.JPG
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so in the end where did the 5 or 20 come from? by factoring?
divide the whole thing by 4
then you get the answer 5 and 20.
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