Question

Dada Equação x^3 - 3x^2+ 5x – 8 = 0, de raízes x1, x2 e x3, determinar:
a) x1 + x2 + x3
b) x1x2 + x1x3 + x2x3
c) x1x2x3

Answer 1

a) x1 + x2 + x3=-b/a

x1 + x2 + x3=3



b) x1x2 + x1x3 + x2x3 =c/a

x1x2 + x1x3 + x2x3=5

c) x1x2x3=-d/a
x1x2x3=8