Answer:
-8x^2-x+5
Explanation:
sum equals add
(-3x^2-7x+9)+(-5x^2+6x-4)
add like terms
-3x^2+(-5x^2)= -8x^2
-7x+6x= -x
9+(-4)= 5
there
4.5m questions
5.9m answers