g(x)= -x^2 -1 -2x f(x)= x+5 find (g-f)(x)
g(x) = -x² - 1 - 2x , f(x) = x + 5⇒ (g-f)(x) = -x² - 1 - 2x - x - 5 = -x² - 3x - 6