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If (b^2=225) then what is the positive value of (b)?
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Answer and explanation
Correct answer: 15
Since the square of 15 is 225, \(15^2=225\). Thus, \(b^2=225\) gives \(b=\pm15\), but the question asks for the positive value, so the answer is 15. Option 25 may seem tempting, but \(25^2=625\), not 225. Exam tip: when the positive value in \(x^2=a\) is asked, take \(\sqrt{a}\).
Frequently asked questions
What is the correct answer to this question?
15
Why is this the correct answer?
Since the square of 15 is 225, \(15^2=225\). Thus, \(b^2=225\) gives \(b=\pm15\), but the question asks for the positive value, so the answer is 15. Option 25 may seem tempting, but \(25^2=625\), not 225. Exam tip: when the positive value in \(x^2=a\) is asked, take \(\sqrt{a}\).
Which subject and chapter does this question cover?
This is a Class 9 Mathematics question. Chapter: Number Systems. Topic: Exponents.
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