Advanced MathEasy–MediumNumber from a quarter of its square
Advanced Math practice question
A positive number is such that one quarter of its square equals 9. What is the number?
Answer: 6
x²/4 = 9, so x² = 36 and x = 6.
Common wrong answers
- If you answered 3
- 3 is √9, forgetting to multiply by 4 first.
- If you answered 36
- 36 is the square, not the number.
- If you answered 2.25
- 2.25 is 9/4, dividing instead of multiplying.
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What are the solutions to the equation 2(x − 3)² − 32 = 0 ?
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