Brainlag PlusRemove a surd from the bottom of a fraction, with √k or a bracket like (b + √k) underneath.
A single surd underneath
Multiply the top and the bottom by the surd.
The value does not change (you multiply by 1), and √k × √k = k.
- 6/√3
- = 6√3/3
- = 2√3
The rest of this lesson and its 7 practice questions are in Plus.
Screen 1 of 2, free to read.
- 7 exam-style questions, marked as you go, each with a worked solution
- Anything you get wrong is saved to your flashcards