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= -6(9x² - 12x + 4)
= -54x² + 72x - 24
2) = 2(2x+1) × 2 × (x-1) + (2x+1)² × 1
= 4(2x²-2x+x-1) + (2x+1)²
= 8x² - 8x +4x -4 + 4x² +4x +1
= 12x² -3