Hi! I really need help with this question: G is inversely proportional to the square of a. If a = -3 when g = 9, find two values for a, which will make g equal 25.
Help, please!

Marquise has 200 meters of fencing to build a rectangular garden. the garden's area (in square meters) as a function of the garden's width w w (in meters) is modeled by: a ( w ) = − w 2 + 1 0 0 w a(w)=−w 2 +100w what side width will produce the maximum garden area? meters