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4) 9x² + (6 - 6)x + (-2)(2)
= 9x² - 4

5) 16x² + (12 - 12)x + (-3)(3)
= 16x² - 9

6) 25x² + (20 - 20)x + (-4)(4)
= 25x² - 16

7) 9x² + (12 - 12)xy + (-4y)(4y)
= 9x² - 16y²

8) 9x² + (15 - 15)xy + (-5y)(5y)
= 9x² - 25y²

9) 36x² + (12 - 12)xy + (-2y)(2y)
= 36x² - 4y²

10) a²x² + (b - b)ax + (-b)(b)
= a²x² - b²