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