Answers:

1. x² + 4x - 5 = (x + 5)(x - 1)

2. x² - 3x + 2 = (x - 2)(x - 1)

3. x² - 6x - 7 = (x + 1)(x - 7)

4. x² + 4x + 4 = (x + 2)(x + 2) or (x + 2)²

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