8. For each case, find the points of inflection. a) f (x) = x' - b) f (x ) =x+ 2 X c) f (x) = (x+1) 5/3 d) f (x) = (1 -x)2 (1+ * ) 2 e) f(x) = x Inx f) f (x) = x-sin x 9. Find c given that the graph of f(x) =cx2 +1/ x2 has a point of inflection at (1, f (1))