math
posted by Anonymous .
42000  R1 + 6R1 = 0.0042 * 7000 R1  0.0041 R1^2 ?
what is R1

math 
Steve
You'll get a better solution if you start off with the right algebra. You should have
6/R1 + 6/(7000R1) = .0042
6(7000R1)+6R1 = .0042*R1(7000R1)
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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