Algebra 2 -Module 6 Test 1. Which function, g, represents the exponential function f(x) = 5* after a vertical stretch by a factor of 2 and a reflection across the x-axis? a. g (x ) = (2 . 5) -x b. g (x) = -(2.5)* c. g(x) = 2. (5 ) - x d.g(x) = -2 . (5)*