Let f(x)=8xf(x)=8x .

What function represents a transformation of f(x)f(x) by a vertical stretch with factor 2?

g(x)=2⋅8xg(x)=2·8x

g(x)=12⋅8xg(x)=12·8x

g(x)=812xg(x)=812x

g(x)=82x