Ответ:
(2a + 6)² = (2a + 6) × (2a + 6) = 4a² + 12a + 12a + 36 = 4a² + 24a + 36
(11 + 4b)(4b - 11) = 44b - 121 + 16b² - 44b = 16b² - 121
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Ответ:
(2a + 6)² = (2a + 6) × (2a + 6) = 4a² + 12a + 12a + 36 = 4a² + 24a + 36
(11 + 4b)(4b - 11) = 44b - 121 + 16b² - 44b = 16b² - 121