Write the function g(x) that describes the given transformation on the function f (x)=5^x

Horizontal shrink by a factor of 1/2 with a reflection in the x-axis

•g(x) = -5^1/2x
•g(x) = -5^2x
•g(x) = –2 (5)^x
•g(x)=5^-2x
•(2) = (-5)^2x