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(2x+3) (2x-3) = (2x)² - (3)² = 4x² - 9
(3x+8) (3x-8) = (3x)² - (8)² = 9x² - 64
(2x + 3) (5x - 6) = 10x² - 12x + 15x - 18 = 10x² + 3x - 18
(3x + 8) (3x - 2) = 9x² - 6x + 24x - 16 = 8x² +18x - 16