consider the function f(x) = -2x^2 - 7. which of the following functions shifts the graph of f(x) up three units and vertically shrinks it by a factor of 1/2?

a. g(x) = -x^2 - 10
b. g(x) = -x^2 - 4
c. g(x) = x^2 - 4
d. g(x) = -1/2x^2 - 4