for f(x) = 4x+1 and g(x) = x^2-5, find (f-g)(x)
f(x) = 4x + 1g(x) = x² - 5(f - g)(x) = (4x + 1) - (x² - 5)(f - g)(x) = -x² + 4x + 1 + 5(f - g)(x) = -x² + 4x + 6
