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Math Help - Radicals?

  1. #1
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    Exclamation Radicals?

    Hey guys, I was away when my Principals 10 class did radicals.. now I have no clue what I'm doing & I have a mid-term next week yay!
    Can someone please help me?

    thanks so much
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  2. #2
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    Quote Originally Posted by ccynd View Post
    Hey guys, I was away when my Principals 10 class did radicals.. now I have no clue what I'm doing & I have a mid-term next week yay!
    Can someone please help me?

    thanks so much
    do you have a specific question?
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  3. #3
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    I have a few haha.

    Uhh lets see, here's one.. I just figured how to do the √ thing haha.

    its 220 - 8 + 18 - 345


    I got an anwser of -55-52... buttt I think I got it wrong.

    here are my steps :S

    2√4 x 5 - √ 4 x 2 + √ 9 x 2 - 3 √ 9 x 5 =

    2 x 2 √5 - 2 √2 + 3√2 - 3 x 3 √5=

    4√5 - 2√2 + 3√2 - 9√5=

    -5√5 - 5√2
    Last edited by ccynd; April 1st 2007 at 12:36 PM.
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  4. #4
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by ccynd View Post
    I have a few haha.

    Uhh lets see, I dont know how to do the "square root" symbol thing.. sooo I'll put this instead *

    its 2*20 - *8 + *18 - 3*45


    I got an anwser of -5*5-5*2... buttt I think I got it wrong.
    Here, tell me if you don't understand what i did?
    Attached Thumbnails Attached Thumbnails Radicals?-surds.gif  
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  5. #5
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by ccynd View Post
    I have a few haha.

    Uhh lets see, here's one.. I just figured how to do the √ thing haha.

    its 220 - 8 + 18 - 345


    I got an anwser of -55-52... buttt I think I got it wrong.

    here are my steps :S

    2√4 x 5 - √ 4 x 2 + √ 9 x 2 - 3 √ 9 x 5 =

    2 x 2 √5 - 2 √2 + 3√2 - 3 x 3 √5=

    4√5 - 2√2 + 3√2 - 9√5=

    -5√5 - 5√2
    you are right up to the second to last step.

    how do you add -2sqrt(2) and +3sqrt(2) and get -5sqrt(2)?
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  6. #6
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    I really don't know.. there could've been something wrong when I wrote it down.. it tends to happen..

    but I was on the right track, right?

    I have another question too (if you don't mind)


    (exp)3√16 + (exp)3√54 {is it the same, but you just keep the same exponent?... }
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  7. #7
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by ccynd View Post
    I really don't know.. there could've been something wrong when I wrote it down.. it tends to happen..

    but I was on the right track, right?

    I have another question too (if you don't mind)


    (exp)3√16 + (exp)3√54 {is it the same, but you just keep the same exponent?... }
    yes, you were on the right track, but you made a rookie mistake, you added -2 and + 3 and got -5!

    what do you mean by (exp)3? do you mean to write the cube root?
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