Answer: -8x^2-x+5
Step-by-step explanation:
I assume you mean adding [tex]-3x^2-7x+9\\-5x^2+6x-4[/tex].
Add like terms together.
[tex](-3x^2+-5x^2)+(-7x+6x)+(9+-4)[/tex]
Simplify.
[tex]-8x^2-x+5[/tex]
