f(x) = x + 5
g(x) = x-3
(f+g)(x) = f(x)+g(x)
(f+g)(x) = (x+5) + ( x-3)
(f+g)(x) = x+5 + x-3
(f+g)(x) = 2x + 2
(f-g)(x) = f(x)-g(x)
(f-g)(x) = (x+5) - (x-3)
(f-g)(x) = x+5-x+3
(f-g)(x) = 8
(f•g)(x) = f(x) • g(x)
(f•g)(x) = (x+5) (x-3)
(f•g)(x) = x^2 - 3x + 5x -15
(f•g)(x) = x^2 +2x -15
(f/g)(x) = f(x)/g(x)
(f•g)(x) = (x+5) / (x-3)
