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If (A) is (\sqrt{18}) on the number line, to which number is (A) closest?

Answer and explanation

Correct answer: (4.24)

The direct answer is option A, 4.24. Simplify the radical: \(\sqrt{18}=\sqrt{9\cdot2}=3\sqrt{2}\). Since \(\sqrt{2}\approx1.4142\), we get \(3\sqrt{2}\approx4.2426\), which is nearest to 4.24. We can also check that \(4.24^2\) is close to 18. Option A, 4.24, is correct because its difference from 4.2426 is very small. Option B, 3.24, is about one unit too small. Option C, 5.24, is about one unit too large. Option D, 6.24, is much farther away. The nearby perfect squares 16 and 25 show that \(\sqrt{18}\) lies between 4 and 5, and the calculation gives its precise approximate position. Do not confuse \(\sqrt{18}\) with 18 or with \(\sqrt{9}+\sqrt{2}\); radicals cannot generally be split across addition.

Related tags

PolynomialsNumber-LineSurdApproximation

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