Advanced Math practice question

Answer: 5

(s + 3)² − s² = 6s + 9 = 39 gives s = 5.

Common wrong answers

If you answered 8

8 is the new side.

If you answered 13

13 divides 39 by 3.

If you answered 6.5

6.5 divides 39 by 6 without subtracting 9 first.

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