QUESTION 1 Let f be the function defined by f (z) = =+2In(x + 1) for > > -1 (a) Find f'(x) , write in a quotient form and factorize (5) (b) Use the sign pattern for f'(x) to determine (1) the interval(s) over which f increases and over which it decreases (8) (1) the coordinates of the local extreme point(s) (2) [15]