Step-by-step explanation:
Because you can't do -x+1 so it would be (1,0) and then you have x^2 +3x-4 which is (-5,6)
8(-10x+3.5y-7)
8Γ-10x + 8Γ3.5y + 8Γ-7
-80x + 28y - 56
therefore
-80x+28y-56 is the correct answer