fFirst find f+g, f-g, fg and Then determine the domain for each function.gf(x) = 4x - 15x -54, g(x)=x-6(f+g)(x) = (Simplify your answer.)

fFirst find f+g, f-g, fg and Then determine the domain for each function.gf(x) = 4x² - 15x -54, g(x)=x-6(f+g)(x) = (Simplify your answer.)