Jawapan

2015-06-12T23:12:11+08:00
X x^{2}  + 2 = k ( 1 - 2x )
x^{2}  + 2 = k - 2kx
 x^{2}  + 2 - k + 2kx = 0
 x^{2} + 2kx + 2 - k = 0

two roots,  b^{2}  - 4ac \ \textgreater \  0
(2k)^{2} - 4(1) (2-k) \ \textgreater \  0
 4k^{2} - 8 + 4k \ \textgreater \  0

 4k^{2} + 4k - 8 \ \textgreater \  0
(k-1) (k+2) \ \textgreater \  0
k - 1 = 0  ,  k + 2 = 0
     k = 1           k = -2