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To find an exponential function, f (x) = ax f (x) = a x, containing the point, set f (x) f (x) in the function to the y y value 25 25 of the point, and set x x to the x x value 2 2 of the point. 25 = a2 25 = a 2. Solve the equation for a a. Tap for more steps a = 5,−5 a = 5, - 5. Substitute each value for a a back into the function f (x) = ax f (x) = a x to find each possible exponential .