Plese help me

Using the definition of the derivative, find f'(x). Then find f'(1), f'(2), and f'(3) when the derivative exists. f ( x ) = -x+ 3x -5 f' (x) = (Type an expression using x as the variable.) Select the correct answer below and, if necessary, fill in the answer box to complete your choice ac O A. f' (1) = (Type an integer or a simplified fraction.) O B. The derivative does not exist. Select the correct answer below and, if necessary, fill in the answer box to complete your choice O A. f' ( 2 ) = r ac (Type an integer or a simplified fraction.) O B. The derivative does not exist. ocks Select the correct answer below and, if necessary, fill in the answer box to complete your choice or que O A. I'(3) = xtbook (Tvne an intener or a simplified fraction )