50021710 50021710 03-05-2019 Mathematics contestada If 'f(x)=x^2-18' and 'g(x)=(x-9)^(-1)(x+9)', find 'g(x)*f(x) a. (x+9)^2 b. (x-9)^2 c. 2(x+9) d. (x+9)(x-9)