Question 212936
Solve for R:
{{{1/R = 1/R[1]+1/R[2]}}} To get the two fractions on the left over a common denominator, multiply the first by {{{R[2]/R[2]}}} and the second by {{{R[1]/R[1]}}}
{{{1/R = (1*R[2]/(R[1]R[2]))+(1*R[1]/(R[1]*R[2]))}}} Simplify the right side.
{{{1/R = (R[1]+R[2])/(R[1]*R[2])}}} Now invert both sides.
{{{highlight(R = (R[1]*R[2])/(R[1]+R[2]))}}}