Teacher2Teacher 
Q&A #4168 
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From: Loyd <Loydlin@aol.com> To: Teacher2Teacher Public Discussion Date: 2006030107:51:30 Subject: Re: Radicals On 2006022821:01:50, wk wrote: > >im having trouble with a couple problems and my teacher is not very >helpful. she says we went over this last week you should know it. well >i failed that test. i would like to see who to do these problem > >If possible i need this by 9:30pm feb 28 > > >sqrt 1/3 > > >2/sqrt5 > >2sqrt9 > >3/4 sqrt64 > >please and thank you > Better late than never. 1. sqrt(1/3)=sqrt1/sqrt3 Rationalize by multiplying numerator and denomator by sqrt2 which gives sqrt3/3 2. Rationalize again by multiplying numerator and denomator by sqrt5 which gives 2sqrt5/5. 3. 9 is a perfect square and 3 is sqrt of 9; so ans is 6sqrt3. 4. sqrt of 64 is 8. So, we have (24/4)sqrt8=6sqrt8 Hope this help. Look up in your book "rationalize." There should be several examples in your book. Also, suggest you memorize the square roots of 4, 9, 16, 25, 36, 49, 64, 81, 100, 121, 144, 169, etc up to 400.
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