help ???
What would happen to the graph of f(x)=2(x-5)^2 if you change the a value to -2?
A. The graph shifts down 2 units
B. The graph opens down
C. The graph shifts left 2 units
D. The graph shifts down 7 units
The negative 'a' value means the parabola opens downward. One way to remember it is that the positive 'a' value means "happy face" or "smile", and a negative 'a' value means "frowny face".
See the image attachment and note the color coding of the graphs.
