It has to be growth because when x goes from a smaller value -2
to larger value 0, y also grows from a smaller value -20 to a 
larger value -5.  That is a growth.

We start with the basic exponential equation:



Then we substitute the point (0,-5)









So the exponential equation  is now



Now we substitute the other point (-2, -20)



And simplify:


 
Multiply both sides by 



Divide both sides by -20









So the equation  is now



The graph looks like this:



which shows it's a growth.

Edwin