Homework Help: math

Posted by peter on Tuesday, October 26, 2010 at 7:19am.

5/11+root5

How would I rationalize this

I think it would be -

Multiply both sides by 11-root5
then use the foil method on the denominator to give you 55-5root5/121+5root11-5root11-5
the 2 roots would cancel out giving you 55-5root5/12-5

so would the answer be 55-5root5/7

thanks in advance

math - Reiny, Tuesday, October 26, 2010 at 8:26am
you have a typo and then transcribed that error

should have been
(55 - 5√5)/(121-5)
=(55 - 5√5)/116

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