14. The length of a rectangle is 20 units more than its width. The area of the rectangle is x4 – 100. Which expression represents the width of the rectangle? A. x² + 10 because the area expression can be rewritten as (x² + 10) (x² – 10) which equals (x? + 10) ((x² + 10) – 20). B. x2 +30 because the area expression can be rewritten as (x² – 10) (x² + 10) which equals (x² – 10) ((x² + 30) – 20). - C. x2 10 because the area expression can be rewritten as - (x² – 10) (x² + 10) which equals (x2 – 10)((x² – 10) + 20). D. x2 – 30 because the area expression can be rewritten as (x2 + 10) (x² – 10) which equals (x? + 10) ((x² – 30) + 20).

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Try substituting 1. You will get 6 and not 0. Try other real values also. What About -2? Let us check.