Please help

Consider the function f (x) = 3x - x2. Use the limit definition to compute the following derivative values: f' (0 ) = f'(1) = f' ( 2 ) = f' (3) = Conjecture a formula for f'(a) that depends only on the value a. That is, in the same way that we have a formula for f (x) (recall f(x) = 3x - x2), see if you can use your work above to guess a formula for f'(a) in terms of a. f'(a) =