(a-5)⁴ Tlg jwb, pakai cara... Pakai cara segitiga pascal

pangkat 4 = 1 4 6 4 1
(a - 5)⁴ = 1(a)⁴(-5)⁰ + 4(a)³(-5)¹ + 6(a)²(-5)² + 4(a)1(-5)³ + 1(a)⁰(-5)⁴
            = a⁴ + (-20a³) + (150a²) + (-500a) + 625
            = a⁴ - 20a³ + 150a² - 500a + 625