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= (4x² - 12x + 9) - (4x² + 12x + 9)
= 4x² - 12x + 9 - 4x² - 12x - 9
= -24x
4x² -6x -6x +9 - (4x² +6x +6x +9)
4x² -12x +9 - (4x² +12x +9)
4x² -12x +9 -4x² -12x -9
4x² -4x² -12x -12x +9 -9
= 0