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Posted by on Thursday, September 9, 2010 at 3:25pm.

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 - , Thursday, September 9, 2010 at 3:39pm

    (5+2sqrt5)/sqrt5 * (sqrt5/sqrt5)=
    (2*sqrt5*sqrt5+5sqrt5)/(sqrt5*sqrt5)=
    (2*5+5sqrt5)/5=2+sqrt5

  • maths - , Thursday, September 9, 2010 at 3:58pm

    but how do you get 2*5+5squared root 5 to become 2+sqrt5 ?

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