# Consider the function below.f(x) = -4x2 + 8x + 9(a) Find the critical numbers of f. (Enter your answers as a comma-separated list.)(b) Find the open intervals on which the function is increasing ordecreasing. (Enter your answer using interval notation. If an answerdoes not exist, enter DNE.)(-0, 3)increasing(3, 0)decreasing(c) Apply the First Derivative Test to identify the relative extrema. (If ananswer does not exist, enter DNE.)dne(х, у) %3Drelative minimumх)3, 13(х, у) %3Drelative maximum

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Step 1

Given,

Step 2

a). Critical numbers are the values of x for which first derivative is zero.

So, we find the derivative of f(x), that is

Step 3

b). A function increases if its first derivative is positive and ...

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