exam Maths Puzzle Numerical Ability

2__
√[3] + √[2]

Rationalize the demominator?

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Hello, Im from norway so i dont know what type of question this is:
This should be REALLY easy but i just cant remember what to do, hehe.
What is a+5? Because if a*5=5a, can a+5 be 5a? 2b+3c-4e where b=2 c=3 e= -2