Advanced MathEasy–MediumNumber from its square root plus two
Advanced Math practice question
Adding 2 to the square root of a positive number gives 7. What is the number?
Answer: 25
√n = 5, so n = 25.
Common wrong answers
- If you answered 5
- 5 is the square root, not the number.
- If you answered 49
- 49 squares 7 without subtracting the 2 first.
- If you answered 81
- 81 squares 9, adding 2 instead of subtracting.
More Advanced Math questions
- Easy–Medium
If f(x) = 2x² − 3, what is f(4)? - Easy–Medium
Which expression is equivalent to (2x³)(3x⁴)? - Easy–Medium
What are the solutions to x² − 16 = 0? - Easy–Medium
Which expression is equivalent to (x + 5)²? - Easy–Medium
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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