(y-2)(y+3)-(y-1)² = y² + 3y - 2y - 6 - (y² - 2y + 1) = y² + y - 6 - y² + 2y - 1 = 3y - 7
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(y-2)(y+3)-(y-1)² = y² + 3y - 2y - 6 - (y² - 2y + 1) = y² + y - 6 - y² + 2y - 1 = 3y - 7