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Math Help - is there a way to solve this?

  1. #1
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    is there a way to solve this?

    81s^2 - 1 = 0
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  2. #2
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    Hello,
    Quote Originally Posted by mathdummy22 View Post
    81s^2 - 1 = 0
    Note that 81=9^2

    so it can be written (9s)^2-1^2=0

    formula for the difference of two squares... ?
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  3. #3
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    you have 81s^2=1, or s^2=1/81. Now take square roots to find s=sqrt(1/81) or s=-sqrt(1/81). So s=1/9 or s=-1/9
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  4. #4
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    Quote Originally Posted by mathdummy22 View Post
    81s^2 - 1 = 0
    I would do the following

    81 s^2 - 1- = 0

    81s^2 = 1 add 1 to both sides

    s^2 = 1/81 divide both sides by 81

    s = 1/9 take square root of both sides.

    Hope that helps. First time to this site.
    Marion
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