Kunci Jawaban Matematika Kelas 9 Halaman 81 Ayo Kita Tinjau Ulang, Persamaan Kuadrat

a = 1

b = - 5

c = 6

(x₁ – 3) + (x₂ – 3) = x₁ – 3 + x₂ – 3

                           = x₁ + x₂ – 6

                           = (- b/a) – 6

                           = (- (-5/1) – 6

                           = 5 – 6 = -1

(x₁ – 3) + (x₂ – 3) = x₁. x₂ - 3 x₁ - 3 x₂ + 9

                           = (c/a) – 3 (x₁ + x₂) + 9