Advanced Math practice question

Answer: 9

Length = (3x² + 6x)/(3x) = x + 2. At x = 7, the length is 9. (Check: area 189 ÷ width 21 = 9.)

Common wrong answers

If you answered 13

13 comes from x + 6, forgetting to divide the 6x by 3x properly (6x/3x = 2).

If you answered 21

21 is the width at x = 7.

If you answered 189

189 is the area at x = 7.

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