Jawabanmu

2014-06-16T01:14:55+07:00
X2 + 4x + 6 = 0
a = 1 b = 4 c = 6

x1 + x2 = -b/a
            = -4/1
            = -4
2014-06-16T04:57:55+07:00
X²-4x²+6 = 0
kita kthui x1=1, x2=-4, x3=6.
jdi x1+x2 = -b/a
               -(-4/1) = 4.