Homework Help: maths

Posted by anonymous on Thursday, September 9, 2010 at 5:08pm.

rationalise 5+2square root 5 divided by square root 5.
please can someone help me on how to get the answer 2+square root 5

maths - Reiny, Thursday, September 9, 2010 at 6:19pm
(5+2√5)/√5
multiply top and bottom by √5

√5(5+2√5)/(√5√5)
=(5√5 + 10)/5
= 5(√5+2)/5
= √5 + 2

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