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Which number does \(\sqrt{7.84}\) represent on the number line?
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Answer and explanation
Correct answer: \(2.8\)
Since \(2.8^2=2.8\times2.8=7.84\), we have \(\sqrt{7.84}=2.8\). The nearby choices are incorrect because \(2.7^2=7.29\) and \(2.9^2=8.41\). In an exam, squaring the options is a quick way to verify a decimal square root.
Frequently asked questions
What is the correct answer to this question?
\(2.8\)
Why is this the correct answer?
Since \(2.8^2=2.8\times2.8=7.84\), we have \(\sqrt{7.84}=2.8\). The nearby choices are incorrect because \(2.7^2=7.29\) and \(2.9^2=8.41\). In an exam, squaring the options is a quick way to verify a decimal square root.
Which subject and chapter does this question cover?
This is a Class 10 Mathematics question. Chapter: Polynomials. Topic: Representing real numbers on the number line.
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