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Mathematics 13 Online
OpenStudy (anonymous):

what is the simplified form of the following expression

OpenStudy (anonymous):

|dw:1379639135923:dw|

OpenStudy (anonymous):

the square root of 1/44

hartnn (hartnn):

you know the square root of 144 ?

OpenStudy (anonymous):

0.02272727272 I think its tht

OpenStudy (anonymous):

lemme give you the multiple choice answers 1/12 1/288 12 2/144

hartnn (hartnn):

can you factor 144 ??? like 70 will be 2*5*7

OpenStudy (anonymous):

im not sure what it would be

hartnn (hartnn):

then start dividing it by 2, if you can 144/2 = .. ?

OpenStudy (anonymous):

72

OpenStudy (anonymous):

72 divided by 2 is 36

OpenStudy (anonymous):

36 divided by 2 18

hartnn (hartnn):

go on ..

OpenStudy (anonymous):

18 divided by 2 9

OpenStudy (anonymous):

9 divided by 2 is 4.5

hartnn (hartnn):

correct! now 9 is not divisible by 2, then take next number 3 9/3 = ... ?

hartnn (hartnn):

you get 4.5 but thats not an integer, thats why we got to 3

OpenStudy (anonymous):

3

OpenStudy (anonymous):

lol 9/3 is 3

hartnn (hartnn):

yes, and 3/3 is 1 you stop when u get 1 so the factors are 144 =2*2*2*2*3*3 got this ?

OpenStudy (anonymous):

ya so that's the factor

hartnn (hartnn):

yup, now since we are taking square root, we combine 2 numbers ata atime like 5*5*7*7 would be 5^2 * 7^2 so what about 2*2*2*2*3*3 ??

hartnn (hartnn):

and square root of (5*5)*(7*7) will be 5*7 what about 2*2*2*2*3*3 ? hint : (2*2)*(2*2)*(3*3)

OpenStudy (anonymous):

wait what are you asking

hartnn (hartnn):

we have 144 as 2*2*2*2*3*3 right ?? i just grouped 2 numbers at a time (2*2)*(2*2)*(3*3) any doubts here ?

OpenStudy (anonymous):

no but what do you want me to do next

hartnn (hartnn):

i want you to realize that when we take the square root of that we will consider the group as one number, \(\sqrt{(2*2)*(2*2)*(3*3) }= 2*2*3\) got this ?

OpenStudy (anonymous):

ya sorta

OpenStudy (anonymous):

ya and when you do the multiplication it makes 144

hartnn (hartnn):

sol \(\sqrt{144}=2*2*3 = .. ?\)

OpenStudy (anonymous):

wait is the answer to this question 1/12

hartnn (hartnn):

yes, it is! \(\sqrt {144}=12 , 1/\sqrt{144}=1/12\) :)

OpenStudy (anonymous):

I forgot the pemdas on the other thing affects the answer

OpenStudy (anonymous):

yay thx!!!!!! tht really helped I understand it a lot better now

hartnn (hartnn):

i am glad to hear that! welcome ^_^

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