10 5 -10 -5 5 10 -5 -10 y = xi+ 2x- 5x3 - 6x Use the graph to answer the question. Which of the following best approximates the interval(s) on which the graph of the function / (x) = x* + 2x3-5x3 -6x is decreasing? O A. (-40,-9)0(16-9) O B. (-40,-2.3) (-0.5.1.3) O C. (-9.1.6) D. (-23,-0.5)w (1.3,60)10 CM -10 -5 5 10 -5 10 _ y = x1 + 2x3 - 5x2 - 6x Ise the graph to answer the question. dentify the set of x-values for which f (x) 20. A. (xx-3 or -15 x50 orx 2 2) O B. (x x5-3 or x2 2) O C. (xx 2} O D. (x -35x-4) O B. (x -1