Question 212960
Kevin, I already answered this problem,
See my answer # 160872.
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Oops! My error, I did not see the subscript of 2.
Let's try again.
{{{1/R = 1/R[1] + 1/R[2]}}}
Solve for {{{R[2]}}}:
{{{1/R = 1/R[1]+1/R[2]}}}} Subtract {{{1/R[1]}}} from both sides.
{{{1/R - 1/R[1] = 1/R[2]}}} Simplify the left side.
{{{(R[1]-R)/(R*R[1]) = 1/R[2]}}} Invert both sides.
{{{R*R[1]/(R[1]-R) = R[2]}}}
{{{highlight(R[2] = R*R[1]/(R[1]-R))}}}