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x² +x
---------------------------------
+ 7x³ -x² 4x
7x⁴ - x³ 4x²
----------------------------
7x⁴ +6x³ +3x² +4x
B) 3x² -x +3
x² -x +4
-------------------------------------
12x² -4x 12
+ -3x³ x² -3x
3x⁴ -x³ 3x²
--------------------------------------
3x⁴ -4x³ +16x² -7x +12