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On the number line, ( \sqrt{\frac{49}{121}} ) is equal to what?

Answer and explanation

Correct answer: ( \frac{7}{11} )

For a nonnegative fraction, the principal square root can be found by taking the positive square root of the numerator and denominator separately. Since \(49=7^2\) and \(121=11^2\), we have \(\sqrt{49/121}=\sqrt{49}/\sqrt{121}=7/11\). Thus the point is represented by \(7/11\), which is option A.

The positive sign matters because the symbol \(\sqrt{\,}\) denotes the principal, nonnegative square root. The value \(49/11\) forgets to take the square root of the denominator, while \(11/7\) reverses the fraction. Also, \(7/121\) is not the result of taking either required square root. Therefore option A follows.

Related tags

Number-LineFraction-RootExact-Value

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