Question

How do you do this question?

Answer 1

"The function is decreasing":

This means the slope of the function will be negative at the given point.  Anywhere the line is going down, from left to right, is decreasing.  This eliminates choices A and C.

"The function is concave down":

This means the curve of the function will be open down (think of an upside down u).  This eliminates choice E.

"f(x)>0":

This is anywhere the curve is above the x axis.  This eliminates choice D.

The answer is Choice B) x=2.

Hope this helps!!