-7x^2+10x-4x^2+9

-7x^2+10x-4x^2+9 can be simplified as follows:

First, combine like terms: -7x^2 - 4x^2 + 10x + 9

= -11x^2 + 10x + 9

So, the simplified form of -7x^2+10x-4x^2+9 is -11x^2 + 10x + 9.