Solve for e. 9e^2f=49 e=±√7f/3 e=±7√f/3 e=±7√f/3f e=±√7f/3f

Divide by the coefficient of e^2, then take the square root.
  e^2 = 49/(9f)
  e = ±7/(3√f) = ±(7√f)/(3f)

The 3rd selection is appropriate:
  e=±(7√f)/(3f)

______
When written in plain text (not typeset), any denominator containing arithmetic must be enclosed in parentheses. When the expression is typeset, the surd and the division bar do the grouping for you.
 

1wthejjebehdn ejdjendnjdnendidne udhejhe djjenejejdjhv95 ag 55wo47wly4wl4uwo46qly4wlu4wly4wtieoyarpyrsou4spu46rsourso64so64so64so64o6raryoaours6oousrosuro6rso6sor6

Hey bby was a good way i just got