Jawabanmu

2014-05-17T16:02:35+07:00
X1 + x2 = 4
x1 . x2 = 6


x1 + x2
=x1 + 2 + x2 + 2
= 4 + 4
= 8

x1 . x2
=(x1 + 2) (x2 + 2)
= x1x2 + 2x1 + 2x2 + 4
= x1x2 + 2(x1 + x2) + 4
= 6 + 8 + 4
= 18

x² - (x1 + x2)x + x1x2 = 0
x² - 8x + 18 = 0