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Math Help - Really quick question, should be easy for most people

  1. #1
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    Really quick question, should be easy for most people

    Hi,

    I have a real quick question. I suck at math and this popped up while finding a derivative. I am not sure if this should be in this part of the board or not, but I am putting it here cause this corresponds to the math level where this popped up.

    If I have 3(2x+h)/h, would it be permissible to cancel out the h and leave 3*2x=6x, or is this incorrect?
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  2. #2
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    This would be incorrect because if you expand it:

    3(2x+h)/h

    = (6x + 3h)/h

    = 6x/h + 3h/h

    = 6x/h +3


    The h can only be canceled out if every term in the numerator had an h.
    Hope this helps!
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  3. #3
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    Ah, right, I see. I knew something was feeling wrong about it, but didnt know what. I'm not a good math person, but I know when I am prolly doing something wrong. Thank you.

    Going back, I think I see where I might've went the wrong way.

    I end up with 6xh+3h^2/h

    Can this be simplified to  6x+3? Cause what I did was just take out the h from the 3h^2...
    Last edited by mr fantastic; March 28th 2009 at 06:28 PM. Reason: Merged posts
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  4. #4
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    Quote Originally Posted by Torlot View Post
    Going back, I think I see where I might've went the wrong way.

    I end up with 6xh+3h^2/h

    Can this be simplified to  6x+3? Cause what I did was just take out the h from the 3h^2...
    \frac{6xh + 3h^2}{h} = \frac{h (6x + 3h)}{h} = \frac{\not{h} (6x + 3h)}{\not{h}} = 6x + 3h.

    It would be better if you posted the whole question ..... Otherwise who knows whether you're even meant to have \frac{6xh + 3h^2}{h} as part of the working ....
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