QUESTION 5 Consider the function f ( x ) = 3x4. -x' 6. Which of the following is the derivative of f when expressed in complete factored form? 2 Of (x ) = 3x2 ( 2+ x ) 2 Of (x) = 3x3 ( 2- x) (2+ x ) Of (x) = 3x3 ( 2-x ) 2 Of (x) = 3x2(2-x) (2+x ) QUESTION 6 Refer to the function f in No.5. Which of the following are the critical numbers of f? O 0 and 2 only O -2 and 2 only O -2, 0, and 2 O 0 and -2 only