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w=Cr^-2 solve for r

  • Alegebra -

    w = Cr^-2
    w = C/r^2
    wr^2 = C
    r^2 = C/w
    r = +/- sqrt (C/w)
    Check mu work.

  • Alegebra -

    i came up with r=sqrt of C/w
    what is the +/- for ? could it be either positive or negative?

  • Alegebra -

    ANYTIME you take the square root of something, you get a + or -. Let me show you why.
    Take the square root of 4. That is 2. Now if we multiply +2 x +2 we get +4. BUT if we multiply -2 x -2 we also get +4. So the square root of 4 is +/- 2. Same with anything else because a minus number x a minus number = a + number.

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