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X²-8X+3X-24 => B
8. (2-m)(m-10)=
2m-20-m²+10m
-m²+2m+10m-20
-m²+12m-20 =>D
9. (4p+9)(p-1)=
4p²-4p+9p-9
4p²+5p-9 => A
10. (2X+9Y)(X-Y)=
2X²-2XY+9XY-9Y²
2X²+7XY-9Y => B