if f(x)=5x-6 and g(x)=x^2-4x-8, find (f+g)(x)a. (f+g)(x)=x^2-x-2b. (f+g)(x)=6x^2-4x-14c. (f+g)(x)=x^2+x-14d. (f+g)(x)=x^2-9x-2

(f+g)(x)= f(x) + g(x) = 5x-6 + x^2-4x-8 = x^2+x-14