Question

Then find f prime left parenthesis 4 right parenthesis​, f prime left parenthesis 0 right parenthesis​, and f prime left parenthesis negative 5 right parenthesis. f left parenthesis x right parenthesis equals 9 x plus 6

Answer 1

For f(x) = 9x+6, f'(x) is always 9.

That is,
  f'(4) = f'(0) = f'(-5) = 9