Answer:
3x^2 -13x +7
Step-by-step explanation:
6x^2 -5x +3 - (3x^2 +8x -4)
Distribute the minus sign
6x^2 -5x +3 - 3x^2 -8x +4
6x^2 - 3x^2 -8x-5x +3 +4