Решение и ответ:
-(a - 3)² + (a + 6)(a - 2) - 8a = -(a² - 2a · 3 + 3²) + a² - 2a + 6a - 12 - 8a =
-a² + 6a - 9 + a² + 4a - 12 - 8a = 6a - 9 + 4a - 12 - 8a = 2a - 21
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Решение и ответ:
-(a - 3)² + (a + 6)(a - 2) - 8a = -(a² - 2a · 3 + 3²) + a² - 2a + 6a - 12 - 8a =
-a² + 6a - 9 + a² + 4a - 12 - 8a = 6a - 9 + 4a - 12 - 8a = 2a - 21