1.
-10x^3+30x-20: (-5x+5) =2x^2+2x-4
10x^3-10x^2
-10x^2+30x-20
10x^2-10x
20x-20
-20x+20
The answer to your question is D.
2.
2x^3-29x+12 : x+4 = 2x^2-8x+3
-2x^3-8x^2
-8x^2-29x+12
8x^2+32x
3x+12
-3x-12
The answer to your question is C.
I hope that this is the answer that you were looking for and it has helped you.