f(x)= 1/3x^3 - x^2 -8x
x-intercept: (0,0) (-3.623,0) (6.623,0)
y-intercept: (0,0)
intervals of increasing: (-infinity, -2) (4, infinity)
intervals of decreasing (-2,4)
local min: (4,-26.667)
local max: (-2, 9.333)
intervals of concave up: (1, infinity)
intervals of concave down:
(-infinity, 1)
points of inflection: (1, -8.667)
i need to write a summary (number line of all important problems and write the concivity and dec/inc) and graph this problem. please help
