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b)- 9x² - 60x -800
(9x)² - 60(9x) -7200
9
(9x-120) (9x +60)
9
3(3x-40) 3(3x+20)
9
(3x-40)(3x+20)
c)- 5x4 + 15x³ + 10x = 5x²(x²+3x+2) = 5x² (x+2)(x+1)