A community for students.
Here's the question you clicked on:
 0 viewing
newatthis
 one year ago
Multiply and simplify Radical Expression
1/2√5(1 1/2√20)
newatthis
 one year ago
Multiply and simplify Radical Expression 1/2√5(1 1/2√20)

This Question is Closed

newatthis
 one year ago
Best ResponseYou've already chosen the best response.1dw:1370239174862:dw

newatthis
 one year ago
Best ResponseYou've already chosen the best response.1Hi I got the answer of 7/2√5 but when I do it I get something different.

yummydum
 one year ago
Best ResponseYou've already chosen the best response.1okay so lets write that a little prettier to deal with:\[{{1\over2}\sqrt{5}}\times{1~{1\over2}\sqrt{20}}~~\implies~~{{1\over2}\sqrt{5}}\times{{3\over2}\sqrt{20}}~~\implies~~{\sqrt{5}\over2}\times{3\sqrt{20}\over2}\]now that that looks a little better, let's solve:\[{{\sqrt{5}\times3\sqrt{20}}\over2}={3\sqrt{100}\over2}\]because 5 x 20 = 100\[3(10)\over2\]i think you've got it from here :)

yummydum
 one year ago
Best ResponseYou've already chosen the best response.1oh i meant to write \[3(10)\over4\]sorry

newatthis
 one year ago
Best ResponseYou've already chosen the best response.1I'm a bit lost I have to simplify this so would'nt 1 1/2√20 be 2 3/2√5

yummydum
 one year ago
Best ResponseYou've already chosen the best response.1\[1 {1\over2} = {3\over2}\]\[\sqrt{20}= 2\sqrt{5}\]\[{3\over2}\times{2\over1}\sqrt{5}~~=~~{3\over\cancel{2}}\times{\cancel{2}\over1}\sqrt{5}~~=~~\large3\sqrt{5}\]

newatthis
 one year ago
Best ResponseYou've already chosen the best response.1but the answer comes out to \[\frac{ 7 }{ 2 }\sqrt{5}\]

yummydum
 one year ago
Best ResponseYou've already chosen the best response.1and where are you getting this from?

newatthis
 one year ago
Best ResponseYou've already chosen the best response.1Our teacher placed the answer as \[\frac{ 7 }{ 2 }\sqrt{5}\]

newatthis
 one year ago
Best ResponseYou've already chosen the best response.1I didn't get this answer either this is why it's confusing

yummydum
 one year ago
Best ResponseYou've already chosen the best response.11/2 times 3/2 = 3/4 sqrt 5 times sqrt 20 = sqrt100 = 10 3/4 times 10 = 7.5 i dont know what your teacher was doing, maybe you copied the question wrong

newatthis
 one year ago
Best ResponseYou've already chosen the best response.1No it's printed on my paper

yummydum
 one year ago
Best ResponseYou've already chosen the best response.1then im really not sure

newatthis
 one year ago
Best ResponseYou've already chosen the best response.1I appreciate your help Thank you yummydum

newatthis
 one year ago
Best ResponseYou've already chosen the best response.1I got as my final answer \[\frac{ 3 }{ 4 }\sqrt{5} \] this is why it was confusing

newatthis
 one year ago
Best ResponseYou've already chosen the best response.1I had a person help me don't I don't believe it's correct here is why unless I'm wrong

saifoo.khan
 one year ago
Best ResponseYou've already chosen the best response.3Alright so i read the whole problem. Where are you stuck? We should get 15/2.

newatthis
 one year ago
Best ResponseYou've already chosen the best response.1\[1\frac{ 1 }{ 2 }\sqrt{20}\] would be \[\frac{ 3 }{ 2 }\] and \[\sqrt{20} would be 2\] add both \[2\frac{ 3 }{ 2 }\sqrt{5}\]

newatthis
 one year ago
Best ResponseYou've already chosen the best response.1teacher has an answer of \[\frac{ 7 }{ 2 }\sqrt{5}\] could the teacher be wrong

saifoo.khan
 one year ago
Best ResponseYou've already chosen the best response.3Yes. Teacher added the sqrt5 by misatke. Or maybe the question you wrote is incorrect.

newatthis
 one year ago
Best ResponseYou've already chosen the best response.1question is multiply and simplify \[\frac{ 1 }{ 2 }\sqrt{5}\left( 1\frac{ 1 }{ 2 } \sqrt{20}\right)\]

saifoo.khan
 one year ago
Best ResponseYou've already chosen the best response.3dw:1370243682678:dw

newatthis
 one year ago
Best ResponseYou've already chosen the best response.1Why is this so complicated? I'm lost

saifoo.khan
 one year ago
Best ResponseYou've already chosen the best response.3Which step is it that you don't understand?

newatthis
 one year ago
Best ResponseYou've already chosen the best response.1how would I multiply \[\frac{ \sqrt{5} }{ 2 }\times \frac{ 3*2 }{ 2 }\sqrt{5}\] I thought you multiply numbers not square roots with numbers

newatthis
 one year ago
Best ResponseYou've already chosen the best response.1my answer was \[\frac{ 3 }{ 4 }\sqrt{5}\] maybe this is wrong

saifoo.khan
 one year ago
Best ResponseYou've already chosen the best response.3dw:1370244388921:dw

newatthis
 one year ago
Best ResponseYou've already chosen the best response.1Wouldn't we keep the root? and just multiply getting \[\frac{ 15 }{ 2 }\sqrt{5}\]

saifoo.khan
 one year ago
Best ResponseYou've already chosen the best response.3No ma'am. Whenever it's given: sqrt3 * sqrt3 we will get "3" as answer. The roots cancel out leaving you with ONE three.

newatthis
 one year ago
Best ResponseYou've already chosen the best response.1This is how I started \[\frac{ 1 }{ 2 }\sqrt{5}(1\frac{1 }{ 2 }\sqrt{20})\] \[\frac{ 1 }{ 2 }\sqrt{5}(\frac{3 }{ 2 }\sqrt{5})\] \[\frac{ 1 }{ 2 }\times \frac{ 3 }{ 2 }=\frac{ 3 }{ 4 }\sqrt{5}\] I know this isn't corrected but I get this

saifoo.khan
 one year ago
Best ResponseYou've already chosen the best response.3How will you simplify sqrt 20?

newatthis
 one year ago
Best ResponseYou've already chosen the best response.1that's right it would be 4*5 which 4 goes down to 2 so it would be \[2\sqrt{5}\]

newatthis
 one year ago
Best ResponseYou've already chosen the best response.1I forgot to add that \[\frac{ 1 }{ 2 }\sqrt{5}(2\frac{3 }{ 2 }\sqrt{5})\] it would be this correct and mix fractions to improper fractions would be \[2\frac{ 3 }{ 2 } would be \frac{ 7 }{ 2 }\] \[\frac{ 1 }{ 2 }\sqrt{5}(\frac{ 7 }{ 2 }\sqrt{5})\]

saifoo.khan
 one year ago
Best ResponseYou've already chosen the best response.3You made a mistake again. :P It's not 2 3/2

newatthis
 one year ago
Best ResponseYou've already chosen the best response.1so it's \[\frac{ 2 }{ 1 }X\frac{ 3 }{ 2 }\]

saifoo.khan
 one year ago
Best ResponseYou've already chosen the best response.3No. I think you should redo the problem. Show me yor steps please.

newatthis
 one year ago
Best ResponseYou've already chosen the best response.1\[\frac{ 1 }{ 2 }\sqrt{5}(1\frac{ 1 }{ 2 }\sqrt{20})\] \[\frac{ 1 }{ 2 }\sqrt{5}(\frac{ 3 }{ 2 } 2\sqrt{5})\] \[\frac{ 1 }{ 2 }\sqrt{5}(\frac{ 3 }{ 2 } 2\sqrt{5})\] at this point I'm lost

saifoo.khan
 one year ago
Best ResponseYou've already chosen the best response.3Awesome. No the 2's on right cancels out. Right?

newatthis
 one year ago
Best ResponseYou've already chosen the best response.1why would it cancel √20 would be 2√5 this is where I'm getting confused

newatthis
 one year ago
Best ResponseYou've already chosen the best response.1is 2 canceling with the other 2

saifoo.khan
 one year ago
Best ResponseYou've already chosen the best response.3sqrt(20) = sqrt(2*2*5) = 2 sqrt5 Agree?

saifoo.khan
 one year ago
Best ResponseYou've already chosen the best response.3Now the 2 from 2sqrt5 and the w in the denominator on the right canel out

newatthis
 one year ago
Best ResponseYou've already chosen the best response.1I'm with you on that

saifoo.khan
 one year ago
Best ResponseYou've already chosen the best response.3Right o what are we left with now?

saifoo.khan
 one year ago
Best ResponseYou've already chosen the best response.3Right. And that is multiplied with..?

newatthis
 one year ago
Best ResponseYou've already chosen the best response.1\[\frac{ 1 }{ 2 }\sqrt{5}\]

saifoo.khan
 one year ago
Best ResponseYou've already chosen the best response.3Right now multiply it out.

newatthis
 one year ago
Best ResponseYou've already chosen the best response.1\[\frac{ 1 }{ 2 }\sqrt{5}\times \frac{ 3 }{ 1 }\sqrt{5}\] Is this looking correct?

newatthis
 one year ago
Best ResponseYou've already chosen the best response.1\[\frac{ 3 }{ 2 }\sqrt{5}\]

newatthis
 one year ago
Best ResponseYou've already chosen the best response.1do I take of the √ and make it \[\frac{ 3 }{ 2 }\times \frac{ 5 }{ 1 }=\frac{ 15 }{ 2 }\]

newatthis
 one year ago
Best ResponseYou've already chosen the best response.1Thanks for everything wow :.)

help123please.
 one year ago
Best ResponseYou've already chosen the best response.1Good job helping @newatthis !!! @saifoo.khan

help123please.
 one year ago
Best ResponseYou've already chosen the best response.1Kudos to @yummydum too!

saifoo.khan
 one year ago
Best ResponseYou've already chosen the best response.3@yummydum is useless.

help123please.
 one year ago
Best ResponseYou've already chosen the best response.1No she isn't :p

help123please.
 one year ago
Best ResponseYou've already chosen the best response.1Yummydum isn't. Or you,for that matter.

newatthis
 one year ago
Best ResponseYou've already chosen the best response.1Thanks for everything it helps a lot when someone knows how to guide and explain it. :)

saifoo.khan
 one year ago
Best ResponseYou've already chosen the best response.3@help123please. believe me. I know her. @newatthis You're welcome. :)

help123please.
 one year ago
Best ResponseYou've already chosen the best response.1Well,yes...you've been here longer than me.

saifoo.khan
 one year ago
Best ResponseYou've already chosen the best response.3Lol. But no doubt she has a brown brain like me! D:

help123please.
 one year ago
Best ResponseYou've already chosen the best response.1Yours is a great brain,Saif.

help123please.
 one year ago
Best ResponseYou've already chosen the best response.1U ARE 2 HELPFUL. Lol.

saifoo.khan
 one year ago
Best ResponseYou've already chosen the best response.3And it's brown too!

saifoo.khan
 one year ago
Best ResponseYou've already chosen the best response.3I'm brown. Brain is brown too. Dummy is brown too. Hence she has a brown brain too.

help123please.
 one year ago
Best ResponseYou've already chosen the best response.1We're prolly weirding @newatthis out. Or at least,I am.

help123please.
 one year ago
Best ResponseYou've already chosen the best response.1'Hence,she has a brown brain too'. Hence. I like that word.

newatthis
 one year ago
Best ResponseYou've already chosen the best response.1no I'm just doing math working my brain, or whatever is left. :)

help123please.
 one year ago
Best ResponseYou've already chosen the best response.1Saif,I just noticed your smartscore is mine,with the numbers flipped upside down. XD

help123please.
 one year ago
Best ResponseYou've already chosen the best response.1*Flips PC upside down* OMGEE I HAVE A 99 SS!

help123please.
 one year ago
Best ResponseYou've already chosen the best response.198% of the time,when typing lol,you're not actually laughing. Did u know? :P

saifoo.khan
 one year ago
Best ResponseYou've already chosen the best response.3Make that 99%. I love laughing. It helps in exercising my face muscles. :P

newatthis
 one year ago
Best ResponseYou've already chosen the best response.1so new question? \[2x \sqrt{7}(3x \sqrt{7})\] \[2x(3x)\sqrt{7}\sqrt{7}\] \[6x(\sqrt{49})\] Would this be correct?

newatthis
 one year ago
Best ResponseYou've already chosen the best response.1sorry I just threw this in here

help123please.
 one year ago
Best ResponseYou've already chosen the best response.1@newatthis please close this post and create a new thread.

yummydum
 one year ago
Best ResponseYou've already chosen the best response.12x * 3x = 6x^2 not just 6x and √49 = 7 so now you have 6x^2 * 7 ....which is?
Ask your own question
Sign UpFind more explanations on OpenStudy
Your question is ready. Sign up for free to start getting answers.
spraguer
(Moderator)
5
→ View Detailed Profile
is replying to Can someone tell me what button the professor is hitting...
23
 Teamwork 19 Teammate
 Problem Solving 19 Hero
 Engagement 19 Mad Hatter
 You have blocked this person.
 ✔ You're a fan Checking fan status...
Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.