bantu jawab persamaan kuadrat

Misal lamda = x1 dan Beta = x2

x² + 3x - 5 = 0
x1 + x2 = -b/a = -3/1 = -3
x1 . x2 = c/a = -5/1 = -5

x1/x2 + x2/x1
= (x1² + x2²) / (x1.x2)
= [(x1 + x1)² - 2x1.x2] / (x1.x2)
= [(-3)² - 2(-5)] / (-5)
= [9 + 10] / -5
= -19/5

= -3 4/5