Nilai x₁ ₊ x₂ ₌ …
x₂ x₁
Pembahasan:
3x² – x + 9 = 0
x₁ + x₂ = –b = 1
a 3
x₁ . x₂ = c = 9 = 3
a 3
x₁ ₊ x₂ ₌ x₁² + x₂²
x₂ x₁ x₁ . x₂
= (x₁ + x₂)² – 2x₁x₂
x₁ . x₂
= (⅓)² – 2.3
3
= ⅑ – 6
3
= 1 – 54
27
= –53
27