Sorry Hayley but that is not correct
-2(4)^x = -2*4x
it cannot be simplified further although it can be rewritten like this:
\(-2*4^x=-2*(2^2)^x=-2^1*2^{2x}=-2^{(2x+1)}\)
If you want to graph
y=-2*4x
here is the graph:
https://www.desmos.com/calculator/hbgkqaxm96
