(а - 4)² - а*(2а - 8) = а² - 8а + 16 - 2а² + 8а = 16 - а² (или = -а² + 16)
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(а - 4)² - а*(2а - 8) = а² - 8а + 16 - 2а² + 8а = 16 - а² (или = -а² + 16)