For the function below, find a) the cntical numbers, b) the open intervals where

Question

For the function below, find a) the cntical numbers, b) the open intervals where the function increasing, and c) the open intervals where it is decreasing f(x) = 2.6 + 4.2x- 1.1x2 The cntical numbers) is/are (Use a comma to separate answers as needed.) List any interval(s) on which the function is increasing (Type your answer in interval notation Use a comma to separate answers as needed.) List any interval(s) on which the function is decreasing (Type your answer in interval notation Use a comma to separate answers as needed )

Explanation / Answer

The critical number for a quadratic can be computed with -b/2a= -4.2/-2.2=21/11 (1.09090909...) From neagtive infinity to our critical number the function is increasing and from our critical number to positive infinity our function is decreasing. You can tell this from the long-run behavior of a quadratic with negative term of degree two. Hope this helps!

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