16Hit1600
Advanced MathMediumNumber from a product of a sum and a difference

Advanced Math practice question

The product of 2 more than a number and 2 less than the same number is 96. If the number is positive, what is it?

Answer: 10

(n + 2)(n − 2) = n² − 4 = 96 gives n² = 100, so n = 10.

Common wrong answers

If you answered 48
48 halves 96.
If you answered -10
−10 is the negative root.
If you answered 9.8
9.8 is √96, forgetting the +4.

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