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newatthis
Group Title
Multiply and simplify Radical Expression
1/2√5(1 1/2√20)
 one year ago
 one year ago
newatthis Group Title
Multiply and simplify Radical Expression 1/2√5(1 1/2√20)
 one year ago
 one year ago

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

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

yummydum Group TitleBest ResponseYou've already chosen the best response.1
okay 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 :)
 one year ago

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

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

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

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

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

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

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

yummydum Group TitleBest ResponseYou've already chosen the best response.1
1/2 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
 one year ago

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

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

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

yummydum Group TitleBest ResponseYou've already chosen the best response.1
no problem :)
 one year ago

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

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

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

newatthis Group TitleBest 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 \[2\frac{ 3 }{ 2 }\sqrt{5}\]
 one year ago

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

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

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

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

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

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

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

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

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

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

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

newatthis Group TitleBest ResponseYou've already chosen the best response.1
This 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
 one year ago

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

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

newatthis Group TitleBest ResponseYou've already chosen the best response.1
I 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 \[2\frac{ 3 }{ 2 } would be \frac{ 7 }{ 2 }\] \[\frac{ 1 }{ 2 }\sqrt{5}(\frac{ 7 }{ 2 }\sqrt{5})\]
 one year ago

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

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

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

newatthis Group TitleBest 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
 one year ago

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

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

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

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

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

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

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

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

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

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

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

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

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

saifoo.khan Group TitleBest ResponseYou've already chosen the best response.3
Like a boss. (y)
 one year ago

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

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

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

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

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

help123please. Group TitleBest ResponseYou've already chosen the best response.1
I'M useless.
 one year ago

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

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

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

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

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

help123please. Group TitleBest ResponseYou've already chosen the best response.1
O_O
 one year ago

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

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

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

help123please. Group TitleBest ResponseYou've already chosen the best response.1
Nope it's not.
 one year ago

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

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

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

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

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

saifoo.khan Group TitleBest ResponseYou've already chosen the best response.3
Haha. Nice catch.
 one year ago

help123please. Group TitleBest ResponseYou've already chosen the best response.1
IKR.
 one year ago

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

help123please. Group TitleBest ResponseYou've already chosen the best response.1
98% of the time,when typing lol,you're not actually laughing. Did u know? :P
 one year ago

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

help123please. Group TitleBest ResponseYou've already chosen the best response.1
Lawl.
 one year ago

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

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

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

yummydum Group TitleBest ResponseYou've already chosen the best response.1
2x * 3x = 6x^2 not just 6x and √49 = 7 so now you have 6x^2 * 7 ....which is?
 one year ago

newatthis Group TitleBest ResponseYou've already chosen the best response.1
\[42x ^{2}\]
 one year ago
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