=[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).