College Algebra 7th Edition

Published by Brooks Cole
ISBN 10: 1305115546
ISBN 13: 978-1-30511-554-5

Chapter P, Prerequisites - Chapter P Review - Exercises: 128

Answer

$r=\pm\sqrt{k\frac{q_{1}q_{2}}{F}}$

Work Step by Step

We solve the equation for $r$: $F=k\displaystyle \frac{q_{1}q_{2}}{r^{2}}$ First we multiply by $r^2$: $F*r^2=k\displaystyle q_{1}q_{2}$ Next we divide by $F$: $r^{2}=k\displaystyle \frac{q_{1}q_{2}}{F}$ Finally, we solve for $r$: $r=\pm\sqrt{k\frac{q_{1}q_{2}}{F}}$
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