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What is the value of ( \sqrt{180}\div\sqrt{20} )?

Answer and explanation

Correct answer: (3)

Direct answer: Option B, 3. Rewrite the expression as \(\frac{\sqrt{180}}{\sqrt{20}}\). Since both radicands are positive, \(\frac{\sqrt a}{\sqrt b}=\sqrt{\frac ab}\). Therefore \(\frac{\sqrt{180}}{\sqrt{20}}=\sqrt{\frac{180}{20}}=\sqrt9=3\). Another check is to simplify first: \(180=9\times20\), so \(\sqrt{180}=\sqrt{9\times20}=3\sqrt{20}efore dividing by \(\sqrt{20}\), giving 3. Option A, 9, is the radicand quotient before taking the square root; it stops one step too early. Option B is correct because \(\sqrt9=3\). Option C, \(\sqrt{160}\), incorrectly subtracts or combines the radicands instead of dividing them. Option D, 6, has no valid calculation and is not the result. The denominator is non-zero, so the division is defined. Remember: when dividing square roots of positive numbers, divide the radicands and then take the square root.

Related tags

Real NumbersSurd DivisionSquare Root

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