Question

Jawablah soal persamaan kuadrat berikut

Answer 1

2x^2 - 6x - 8 = 0
(2x + 2) (x - 4) = 0

2x + 2
2x = 2
X1 = 2 / 2 = 1

x - 4
X2 = 4

a. X1^2 + X2^2 = 1^2 + 4^2
= 1 + 16
= 17

b. 1/X1 + 1/X2 = 1/1 + 1/4
= 4/4 + 1/4
= 5/4