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42000 - R1 + 6R1 = 0.0042 * 7000 R1 - 0.0041 R1^2 ?
what is R1

  • math -

    You'll get a better solution if you start off with the right algebra. You should have

    6/R1 + 6/(7000-R1) = .0042
    6(7000-R1)+6R1 = .0042*R1(7000-R1)
    42000 - 6R1 + 6R1 = 0.0042*7000*R1 - 0.0042*R1^2

    .0042 R1^2 - 29.4 R1 + 42000 = 0
    R1^2 - 7000 R1 + 10,000,000

    That should give you better results. It might be easier to do the math using scientific notation...

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