pls show me your work

2. Given f(x) = x3 - 18x2 + 81x, use a sign chart to idenify where f (x) is increasing, decreasing, find local extrema, identify intervals on which f is concave upward, concave downward. Sketch graph. A). Sign chart B) f' (x) = C) f" (x) = D) interval(s)f(x)increasing E) interval(s)f(x)decreasing F) Local Extrema G) interval(s)f(x)concave upward H) interval(s)f(x)concave downward