Advanced MathEasy–MediumPositive number from a square minus one
Advanced Math practice question
The square of a positive number, decreased by 1, equals 8. What is the number?
Answer: 3
n² = 9, so n = 3.
Common wrong answers
- If you answered 9
- 9 is n².
- If you answered 4.5
- 4.5 halves 9.
- If you answered 2.65
- 2.65 is √7, subtracting 1 from 8 instead of adding.
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For x ≠ 0, which expression is equivalent to (x² + 3x) / x? - Easy–Medium
What are the solutions to the equation 2(x − 3)² − 32 = 0 ?
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