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What is obtained by simplifying ( \sqrt{18} )?

Answer and explanation

Correct answer: (3\sqrt{2})

To simplify a square root, look for a factor inside the radical that is a perfect square. Here, write 18 as the product of 9 and 2: \\(18=9\\times2\\). Since the square root of 9 is 3, the square root of the product can be separated as \\(\\sqrt{18}=\\sqrt{9\\times2}=\\sqrt{9}\\sqrt{2}=3\\sqrt{2}\\). The remaining factor 2 has no square factor greater than 1, so this is the simplest radical form.

Option A is correct because it gives \\(3\\sqrt{2}\\). The expression \\(2\\sqrt{3}\\) would square to 12, not 18, so it is not equivalent. Also, \\(9\\sqrt{2}\\) is too large, and \\(\\sqrt{9}=3\\) is not equal to \\(\\sqrt{18}\\). The essential step is separating the perfect-square factor 9 from the number under the square root.

Related tags

Real NumbersClass 9Surd Simplification

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