a) (5x - 3)(5x + 3) = (5x)² - 3² = 25x² - 9
б) (2a + 3)² = (2a)² + 2 * 2a * 3 + 3² = 4a² + 12a + 9
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a) (5x - 3)(5x + 3) = (5x)² - 3² = 25x² - 9
б) (2a + 3)² = (2a)² + 2 * 2a * 3 + 3² = 4a² + 12a + 9