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2.) = 6 + 2a + 3a + a²
= 6 + 5a + a²
3.) a² + b²
4.) a² - b²
5.) = a² - ab +ab - b²
= a² - b²
6.) x² + 4y²
7.) 4x² -9y²
8.) = 25x² - 10xy +10xy - 4y²
= 25x² - 4y²