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b. 2x² - x + 10x - 5= 2x² - 9x -5
c. 14x - 49 - 4x² + 14x = -4x² +28x - 49
b. (x+5)(2x-1) ⇒ 2x² - x + 10x - 5 ⇒ 2x² + 9x - 5
c. (7-2x)(2x-7) ⇒ 14x - 49 - 4x² + 14x ⇒ -4x² + 28x - 49