A formula for a function y = f(x) is f(x) = 3x" + 7. Find f (x) and identify the domain and range of f (x). To check the answer, determine whether f(f (x)) =f (f(x)) =x. . . . F 1 ( x ) = [ (Type an exact answer, using radicals as needed.)7 Let f(x) = - -X +7. Find f (x). Graph f(x) and f (x) together. Evaluate df df- 1 dx at x = 1 and dx at x = f(1 ). F 1 (x ) =df- 1 Let f(x) = 3x" - 5x - 2, x2 1.5. Find the value of dx at the point x = 782 = f(7). df- 1 The value of dx at the point x = 782 = f(7) is (Type a simplified fraction.)