Which of the following is greatest?

Correct answer marked below

10 \sqrt{3}

9 \sqrt{4}

Correct

8 \sqrt{5}

7 \sqrt{6}

6 \sqrt{7}

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What this question tests

Your handling of square and higher roots, including simplifying radicals.

Forgetting the ± when taking a square root to solve an equation, or assuming √(a²) = a.