Question: Please help me. Thank you. d D Question 19 4 pts ZZ ac 1 - 2x 6x - 6 Let f(x) = (ac + 1)3

Please help me. Thank you.

d D Question 19 4 pts ZZ ac 1 - 2x 6x - 6 Let f(x) = (ac + 1)3 , with f' (2) = (ac + 1)4 and f" (a) = (2 + 1)5 The f(a) is both decreasing and concave up on which of the following intervals? O (1, 00) only. O (-00, - 1) U (1, 00) O only 0 ( - 1 , 2 ) U ( 1,00 ) 0 ( - 00 , - 1 ) U ( 2, 1 )
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