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What is the correct simplified form of ( |3-\sqrt{20}| )?

Answer and explanation

Correct answer: ( \sqrt{20}-3 )

The direct answer is option A: \(\sqrt{20}-3\). Since \(\sqrt{20}=2\sqrt{5}\) and \(20>9\), we have \(\sqrt{20}>3\). Therefore \(3-\sqrt{20}\) is negative. The absolute-value rule says \(|y|=-y\) when \(y<0\), so \(|3-\sqrt{20}|=-(3-\sqrt{20})=\sqrt{20}-3\). Option A has exactly this value. Option B forgets to change the sign. Option C changes a minus into a plus, which is not what absolute value does. Option D has the same positive terms but in the wrong order, so it represents \(\sqrt{20}+3\), a different number. Always check whether the expression inside absolute value is positive or negative first.

Related tags

Real NumbersAbsolute ValueSurds

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