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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