#1**+2 **

Note that the function is at a max at x = 2

From there....the function decreases as we move to the right...so...it decreases on ( - 2, inf ) = 2 < x < inf ⇒ "C"

{ Positive infinity is to the right....negative infinity is to the left.... on the x axis }

I think that you are getting confused..."interval" usually refers to the x axis values

The function decreases to -infinity along the y axis as we move to the right

So we can say that, as we move toward infinity on the x axis....the function decreases to -infinity along the y axis

Does that make sense....???

CPhill
Oct 2, 2018