Which function represents the exponential function f(x)=3x after a vertical stretch by a factor of 8 and a reflection across the x-axis? A) g(x) =3-8xB) g(x) =-3 8xC) g(x) =8·3-xD) g(x) =-8·3x

-8×3x represents a vertical strech by a factor of
8 and a reflection across the x-axis.

The answer is D.