Let f(x)=- 4 (a) Find the derivative, f'(x). (b) Find f'(2). (a) What is the first step in finding the derivative of f(x)= ? + OA. Rewrite the function in the form f(x) = x OB. Substitute x+h for x in the original function. OC. Rewrite the function in the form f(x) = rx. OD. Rewrite the function in the form f(x)=x. Rewrite f(x)= f(x) = 1 in this form. x Which rule of derivatives should be used to differentiate functions of this form? OA. The rule that if f(x) = ax, then f'(x) = a OB The rule that if f(x)=mx+b, then f'(x)=m