Factoring Quadratics & Quadratic Applications

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When a positive number is subtracted from its square the result is 42. Find the number.

x = 7

The length of a rectangle is 8 more than the width. If the area of the rectangle is 20, find the dimensions of the rectangle.

x=2 and x=10

A positive number squared decreased by three times the number is 18. Find the number.

x=6

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