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Numerical Inequalities · Question 29 of 79

Question 29

MediumOriginal question

How do 13−2\frac{1}{\sqrt{3} - \sqrt{2}} and 3+2\sqrt{3} + \sqrt{2} compare?

Options for question 29

Show the answer and explanation
CorrectNot quiteAnswer D

Correct answer: D

Explanation

  1. Multiply top and bottom by 3+2\sqrt{3} + \sqrt{2}: the bottom becomes 3−2=13 - 2 = 1.

  2. So 13−2=3+2\frac{1}{\sqrt{3} - \sqrt{2}} = \sqrt{3} + \sqrt{2}.

Worth noting

3−2>0\sqrt{3} - \sqrt{2} > 0, so the first number is positive.

Concept
Rationalising to compare
Typical time
90 s
Your time
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The rule this testsComparing numbers
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Ten questions from Numerical Inequalities, at your own pace.

Practise this chapter →

Ten questions from Numerical Inequalities, at your own pace.