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Anyone any good in math?

I am taking an online math course and I do not understand my assignment at all. It has to deal with square roots. Here is an example of one of the problems:

√3 -9 divided(or over) √12 + √3

Answer Question
 
OneChance

Asked by OneChance at 6:45 PM on Apr. 19, 2009 in Just for Fun

Level 1 (0 Credits)
Answers (9)
  • Is the square root sign over just the three in the numerator, or over the (3-9)?

    Anonymous

    Answer by Anonymous at 6:48 PM on Apr. 19, 2009

  • Oh, and what are you supposed to do to the problem? Simplify or is it an equation (and you forgot to put what it's equal to LOL)?
    Anonymous

    Answer by Anonymous at 6:49 PM on Apr. 19, 2009

  • Just the 3
    OneChance

    Answer by OneChance at 6:49 PM on Apr. 19, 2009

  • I know you have to get rid of the square roots on the bottom... but I don't remember how... I hope that little bit at least helps
    ZaTa

    Answer by ZaTa at 6:49 PM on Apr. 19, 2009

  • I didn't forget to put what it's equal to, that is what the problem says. I am supposed to rationalize the denominator.
    OneChance

    Answer by OneChance at 6:50 PM on Apr. 19, 2009

  • do you know if the square root of 12 = 4 square roots of 3? o.o that would make things a lot easier
    SandraB383

    Answer by SandraB383 at 7:07 PM on Apr. 19, 2009

  • AHA i has the answer. (√3 -9) √3 all over 9
    SandraB383

    Answer by SandraB383 at 7:16 PM on Apr. 19, 2009

  • √12 = 2√3 which made it a lot easier =]
    SandraB383

    Answer by SandraB383 at 7:17 PM on Apr. 19, 2009

  • square root of 12 = square root of 2x6 = square root of 2x2x3 = 2(square root of 3)

    So....

    2(square root of 3) + square root of 3

    equals

    square root of 3 (2+1) = square root of 3 (3)

    So...

    3(square root of 3) is the simplification of your denominator. Multiply top and bottom by (square root of 3)/(square root of 3)

    Simplify.
    Anonymous

    Answer by Anonymous at 7:18 PM on Apr. 19, 2009

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