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= 9x² - 8x² + 7x³ - 5x³
= x² - 2x³
2. = 7a(1+b) - 3b(1+a)
= 7a + 7ab -3b - 3ab
= 7a + 7ab - 3ab - 3b
= 7a + 4ab - 3b
3. = 3/x+1 + 3/x-1 = 3(x-1) + 3(x+1) per (x+1) (x-1)
= 3x-3 + 3x+3 per x² -x +x -1
= 3x + 3x -3 + 3 per x² - 1
= 6x per x² - 1