3x²-x +9=0 adalah x1 dan x2 maka X1 per x2 + x 2 per x 1 = ​

3x² – x + 9 = 0

a = 3

b = -1

c = 9

x₁ + x₂

= -b/a

= -(-1)/3

= 1/3

x₁ . x₂

= c/a

= 9/3

= 3

x₁² + x₂²

= (x₁ + x₂)² – 2.x₁.x₂

= (1/3)² – 2(3)

= 1/9 – 6

= 1/9 – 54/9

= -53/9

x₁/x₂ + x₂/x₁

= (x₁² + x₂²) / x₁.x₂

= (-53/9) / 3

= -53/27