Posted by Shreya on Sunday, January 8, 2012 at 11:15pm.
the formula 1/R = 1/R1 + 1/R2, concerning resistance in an electrical circuit is used in physics. if R = 3 ohms and R1 is 8 ohms more than R2, the value of R1 be?
this also not make any sense to me

mathcalculus  Damon, Monday, January 9, 2012 at 5:21am
R2 = R1  8
R1 R2 = R R2 + R R1 = R(R1+R2)
R1(R18) = 3(2 R1  8)
R1^2  8 R1 = 6 R1  24
R1^2 14 R1 + 24 = 0
(R112)(R12) = 0
If R1 were 2, R2 would be negative, no good
so
R1 = 12 (and R2 is 4)

mathcalculus  Shreya, Monday, January 9, 2012 at 10:05am
that make sense now :) thanks very much damon :)
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