(y - 4) (y + 2) - (y - 2)²
у² + 2у - 4у - 8 - (у² - 4у + 4)
у² + 2у - 4у - 8 - у² + 4у - 4
2у - 12
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(y - 4) (y + 2) - (y - 2)²
у² + 2у - 4у - 8 - (у² - 4у + 4)
у² + 2у - 4у - 8 - у² + 4у - 4
2у - 12