R (r1+r2) = r1r2 solve for R

We need to solve for R, This is really simple.

The original expression is:

R (r1 + r2) = r1r2

To solve for a certain variable, we need to get this variable alone on one side of the equation and equate it with the other side.

In the given expression, to get R alone on one side we have to eliminate (r1 + r2).

In order to do this, we will divide both sides by (r1 + r2).

Doing this, we get the solution as follows:

R = (r1r2) / (r1 + r2)