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# Factor polynomials: quadratic methods (challenge)

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## Problem

The rectangle below has an area of 3, k, squared, plus, 12, k, minus, 7, k, n, minus, 28, n square meters and a length of 3, k, minus, 7, n meters.
What expression represents the width of the rectangle?
start text, W, i, d, t, h, end text, equals
meters
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