(3x power over 2-7x+11)+(6x power over 2+9x-81)=
i know i supposed to add this but that's all i dunno what to add and not to add
I don't know what you mean by "3x power" or "6x power." If you are talking about an exponent, you need to indicate what power it is — x squared (x^2), x cubed (x^3) and so on.
Repost in clearer terms.