Advanced MathEasyRecovering a number from its square plus one
Advanced Math practice question
Fen squares a positive number and then adds 1, getting 10. What number did Fen start with?
Answer: 3
n² + 1 = 10 gives n² = 9, so n = 3.
Common wrong answers
- If you answered 9
- 9 is n², not n.
- If you answered 11
- 11 adds 1 instead of subtracting it.
- If you answered 4.5
- 4.5 halves 9 instead of taking the square root.
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