Which function represents g(x), a reflection of f(x) = 4across the x-axis? g(x) = −4(2)x g(x) = 4(2)−x g(x) = −4 g(x) = 4

1. f(x)=4 is a constant function. The result is 4 for all x'es.
 
for example f(1)=4, f(5)=4 so when we plot the points (1, 4), (5, 4) a line parallel to the x-axis, intercepting the y axis at 4, is formed.

2. The reflection g(x) of f(x) is the graph of points (1, -4), (5, -4)

so g(1)=-4, g(5)=-4 that is g(x)=-4