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For what value(s) of b is the x-component of the force maximized?

I know to maximize the force we need to maximize [itex] F_Qq = k Qq b/(3^2 + b^2)^{3/2}[/itex].

To do this we need to set the first derivative to zero and solve for b. Can someone walk me through this derivative? Having trouble with this and I can't seem to get it. The b in the numerator and 3/2 power came from taking the unit vector.

kQq are just constants so we just need to take the derivative of [itex]b/(9 + b^2)^{3/2}[/itex] no?