Jawabanmu

2014-02-19T22:45:02+07:00
X1 + x2 = 2
x1.x2 = -23+k

x1² + x2² = (x1+x2) - 2.x1.x2
              = 2 - 2(-23+k)
              = 2 - (-46+2k)
              = 2 + 46 - 2k
              = -2k +48