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If \(a=\sqrt{50}\) on the number line, then \(a-7\) is closest to which of the following values?

Answer and explanation

Correct answer: 0.07

Since \(7^2=49\) and \(8^2=64\), \(\sqrt{50}\) is just slightly greater than 7. More precisely, \(\sqrt{50}\approx7.071\), so \(a-7\approx0.071\), which is closest to 0.07. The value 0.7 is ten times larger than this difference. Exam tip: estimate the square root near the nearest perfect square before performing the required operation.

Related tags

Number LinePolynomial RootsEstimationSquare RootsReal NumbersRepresenting Real Numbers On The Number LinePolynomialsMathematics

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