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2. x² + 2x³
3. 7a+7ab-3b-3ab = 7a+4ab-3b
= -2x - 2y
2. 9x² + 7x³ - 8x² - 5x³ = 9x² - 8x² + 7x³ - 5x³
= x² + 2x³
3. 7a (1+b) - 3b (1+a) = 7a + 7ab - 3b - 3ab
= 7a + 7ab - 3ab - 3b
= 7a + 4ab - 3b