1) x² + 4x + 1 = (x² + 4x + 4) + 1 - 4 = (x + 2)² - 3
2) - b² + 6b - 8 = - (b² - 6b + 8) = - (b² - 6b + 9) + 1 = - (b - 3)² + 1
1) x² + 4x + 1 = (x² + 4x + 4) + 1 - 4 = (x + 2)² - 3
2) - b² + 6b - 8 = - (b² - 6b + 8) = - (b² - 6b + 9) + 1 = - (b - 3)² + 1