Question

Tolong dengan cara penyelesaiannya

Answer 1

2x^3 + 6x^2 - 5x - 3 = 0
a = 2, b = 6, c = -5, d = -3
x1 + x2 + x3 = -b/a = -6/2 = -3
x1x2 + x1x3 + x2x3 = c/a = -5/2
x1.x2.x3 = -d/a = -3/2

x1^2 + x2^2 + x3^2
= (x1 + x2 + x3)^2 - 2(x1x2 + x1x3 + x2x3)
= (-3)^2 - 2(-5/2)
= 9 + 5
= 14