## College Algebra 7th Edition

$r = \pm \sqrt{\dfrac{GmM}{F}}$
Multiply $r^2$ on both sides of the equation to obtain: $Fr^2=GmM$ Divide by $F$ on both sides of the equation to obtain: $r^2=\dfrac{GmM}{F}$ Take the square root of both sides to obtain: $r = \pm \sqrt{\dfrac{GmM}{F}}$