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= 4x² - x² + x + 2
= 3x² + x +2
b. 2ab - 3bc + 5ba - 4cb
= 2ab + 5ba - 3bc - 4cb
= 7ab - 7bc
= 7b (a-c)
c. -2 (2x² + 3x - 4)
= -4x² - 6x + 8