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4)

4x (x - 2) - (2x - 2)²

= 4x² - 8x - (4x² - 8x + 4)

= 4x² - 8x - 4x² + 8x - 4

= 4x² - 4x² - 8x + 8x - 4

= - 4

5)

5x - 25 = 5 (x - 5)

6)

15x - 15 = 15 (x - 1)

7)

(x - 1) (x + 2) + (x - 1) (2x + 3)

= (x - 1) (x + 2 + 2x +3)

= (x - 1) (3x + 5)

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