=[2x^2+6x+4]/(k+ 1)+(k+ 1)x/(k+ 1)
=[2x^2+6x+4]/(k+ 1)+x
To sum up, when 2x 2+6x+4 = 0, the value has nothing to do with k.
So (x+ 1)(2x+4)=0.
X=- 1,-2。
Y=0+x=- 1,-2。
The coordinates are (-1,-1)(-2, -2).