Answer
$I=\frac{E}{(R+r)}$
Work Step by Step
Factor out $I$ from the first two terms. Then divide both sides by $R+r$.
$IR+Ir=E$ for $I$
$I(R+r)=E$
$I=\frac{E}{(R+r)}$
College Algebra (6th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-32178-228-3
ISBN 13:
978-0-32178-228-1
Chapter 1 - Equations and Inequalities - Exercise Set 1.3 - Page 135: 71
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