If (y^2=441) then what is the positive value of (y)?
Answer and explanation
Correct answer: 21
Since 21 × 21 = 441, the positive square root of 441 is 21. Although the equation y² = 441 has two solutions, 21 and −21, the question asks for the positive value, so 21 is correct. The close distractor 19 is incorrect because 19² = 361. Exam tip: when the positive value is asked in y² = a, take √a.
Frequently asked questions
What is the correct answer to this question?
21
Why is this the correct answer?
Since 21 × 21 = 441, the positive square root of 441 is 21. Although the equation y² = 441 has two solutions, 21 and −21, the question asks for the positive value, so 21 is correct. The close distractor 19 is incorrect because 19² = 361. Exam tip: when the positive value is asked in y² = a, take √a.
Which subject and chapter does this question cover?
This is a Class 9 Mathematics question. Chapter: Number Systems. Topic: Exponents.
Student feedback
Was this question useful?
👍 0 Helpful 👎 0 Not helpful
Yes 0% No 0%
0 responsesStudent Reviews
No published reviews yet.
