ok, I get it now!

$\displaystyle 2+ C = -6 $

So $\displaystyle C = -8 $

Here is another (sorry I'm trying to pick this up myself with only the textbook and I'm trying my best

)

Find the value of A,B,C if $\displaystyle Ax(x-1)+Bx^2+C(x-1)\equiv x-4-3x^2 $

Expand: $\displaystyle Ax^2 - Ax+Bx^2+Cx-C$

I'm so sure what to do next so I group the terms into groups?

$\displaystyle x^2(A+B) -x(A-C) -C $

I'm pretty sure this is incorrect. Could someone help me out (not necessarily give me the answer)

Thanks for all the help!!!!