Answer
$R_1\geq 2$
Work Step by Step
$R = \frac{1}{\frac{1}{R_1}+\frac{1}{R_2}}=\frac{R_1R_2}{R_1+R_2}$
Put $R_2=2$ and solve for $R_1$ when R >= 1
$\frac{2R_1}{R_1+2}\geq 1$
$2R_1\geq R_1+2$
$R_1\geq 2$
Algebra and Trigonometry 10th Edition
by Larson, Ron
Published by
Cengage Learning
ISBN 10:
9781337271172
ISBN 13:
978-1-33727-117-2
Chapter 1 - 1.8 - Other Types of Inequalities - 1.8 Exercises - Page 149: 81
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