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= 4k² +2k -k² +3k
= 4k² -k² +2k +3k
= 3k² +5k
B. (2x² +3x +4) -(x² +2x +3)
= 2x² +3x +4 -x² -2x -3
= 2x² -x² +3x -2x +4 -3
= x² +x +1