f(x) = 2x, g(x) - x² - 1x dan h(x) = 2 + x fungsi (fogoh)(x)=

(fogoh)(x)= fog(h(x))
                 = fog(2+x)
                 = f[(2+x)² - (2+x)]
                 = f(x²+x+4)
(fogoh)(x)=2(x²+x+4)
                 =2x²+2x+8