Jika f={(2,4),(3,5),(4,−1),(5,2)} dan g={(2,, −3),(3,3),(4,2),(5,4),(−1,1)}, Maka gof = .. A. {(1,1),(2,3),(3,1),(4,3),(5,4)} B. {(2,2),(3,4),(4,1),(5,−3)} C. {(1,2),(2,3),(3,4),(4,−3)} D. {(2,3),(3,4),(4,5),(5,4)} E. {(1,1),(2,3),(3,4),(4,5),(5,5)}

Jawaban yang benar adalah B. {(2,2),(3,4),(4,1),(5,−3)} Konsep =>fungsi komposisi (gof)(x) = g(f(x)) artinya f dimasukkan ke g Diketahui f={(2,4),(3,5),(4,−1),(5,2)} g={(2,−3),(3,3),(4,2),(5,4),(−1,1)} => gof (x) = g(f(x)) x = 2 => gof (2) = g(f(2)) = g (4) = 2 didapat (2,2) x = 3 => gof (3) = g(f(3)) = g (5) = 4 didapat (3,4) x = 4 => gof (4) = g(f(4)) = g (-1) = 1 didapat (4,1) x = 5 => gof (5) = g(f(5)) = g (2) = -3 didapat (5, -3) Jadi jawaban yang benar gof adalah B. {(2,2),(3,4),(4,1),(5,−3)}