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= 9x² - 24x + 16 - 2(4x² - 12x + 9) - (9x² - 64) =
= 9x² - 24x + 16 - 8x² + 24x - 18 - 9x² + 64 = -8x² + 62
(2x - 3)² - (√5x - 3)(√5x + 3) =
= 4x² - 12x + 9 - (5x² - 9) =
= 4x² - 12x + 9 - 5x² + 9 = -x² - 12x + 18