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Student B shows us the work as well as how the two binomials relate to the area of the base of the 3D image.

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Student D multiplied the first two binomials correctly which is

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This has the correct first two binomials multiplied as well as an organized way to multiply the solution by the trinomial

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Student A went to the 3D image  to help represent the problem.  How is it different than Student C's work?