One of the most important and exam oriented question from real numbers chapter as it was already asked in previous year papers and we have to simplify (2√45+3√20)/2√5
RS Aggarwal, Class 10, chapter 1E, question no 10
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(2√45+3√20)/2√5
=[2√(3.3).5+3√(2.2).5]/2√5
=(2.3√5+3.2√5)/2√5
=(6√5+6√5)/2√5
=12√5/2√5
=6