C. my calculations show no critical values and no relative points. Are my calculations correct?

Find a) any critical values and b) any relative extrema t(x)=x +8x+9 a) Select the correct choice below and, if necessary, fill in the answer box within your choice O A. The critical value(s) of the function is/are (Use a comma to separate answers as needed.) . B. The function has no critical values. b) Select the correct choice below and, if necessary, fill in the answer box(es) within your choice O A. The relative minimum point(s) is/are and the relative maximum point(s) is/are (Simplify your answers. Type ordered pairs, using integers or fractions. Use a comma to separate answers as needed.) O B. The relative maximum point(s) is/are |and there are no relative minimum points. (Simplify your answer. Type an ordered pair, using integers or fractions. Use a comma to separate answers as needed.)