F=-MW2X

the W is squared

trying to find W

Starting with


F= - MW^2X


Divide through by -MX to get:


- \frac F {MX} = \frac {\cancel {-M}W^2 \cancel X}{\cancel {-MX}} = W^2


Then take square root of both sides:


W = \pm \sqrt {- \frac F {MX}}