I've solved a function to this answer:

$\displaystyle x^2-2x-kx+4=0$

How would you convert the above into $\displaystyle ax^2+bx+c$ format?

I've tried it like this

For bx: I've tried converting -2x-kx into $\displaystyle -x(2+k)$ by taking -x common, but that's not giving me the right roots.

What am I doing wrong? What's the rule here to form bx?

Thanks!