Math

Stupid question time. I need to figure out how to rearrange equations to solve for x in my chemistry homework, which involves putting equations in quadratic form first. But I can't for the life of me remember how to "rearrange" them correctly.

So what in the step by step way to do this with the example such as:

1.9 = (2.0-x)/(x)(x)

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asked by Marcus
  1. 1.9 = (2.0 -x)/x^2

    Multiply both sides by x^2

    1.9x^2 = 2.0 - x

    Add the opposite to both sides so that you have 0 on one side.

    1.9x^2 + x - 2.0 = 0

    Now, you can use the quadratic to solve for x.

    Quadratic: -b +/- the square root of (b^2 - 4ac) all over 2a.

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    posted by Dr. Jane

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