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B. 3 (2x² -4x + 5 ) + 2(4x² + 3x -7 )
= (6x² - 12x + 15) +( 8x² + 6x - 14)
= 6x² + 8x² - 12x + 6x + 15 - 14
= -2x² - 6x - 1