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

First find f + g, f- g. fg and — Then determine the domain for each function.f(x) = 4x² - 15x -54, g(x)=x-6(f+g)(x) = 4x² - 14x-60 (Simplify your answer.)What is the domain of f + g?30(-00,00)(-?, -30) (-370,00)00,7O[0,00)(f- g)(x) = (Simplify your answer.)