3с(с + 2) - (3 + с)² = 3с² + 6с - (9 + 6с + c²) = 3c² + 6c - 9 - 6c - c² = 2c² - 9
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3с(с + 2) - (3 + с)² = 3с² + 6с - (9 + 6с + c²) = 3c² + 6c - 9 - 6c - c² = 2c² - 9