Question

Help!

Answer 1

\[Solve for R : R(r _{1} + r _{2}) = r _{1}r _{2}\]

Answer 2

you need to get R by itself. R is multiplied by (r1+r2) we need to do the opposite operation?

\[\frac{ r_{1}r_{2} }{ (r_{1}+r_{2})} = R\]

Answer 3

Don't they cancel out?