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b. 5x²-x+25x-5 = 5x²-26x-5
c. 14x-49-4x²+14x
b. (x+5) . (5x-1) = 5x²-1x+25x-5 =5x²+24x-5
c. (7-2x) . (2x-7) = 14x-49-4x²+14x = 28x-49-4x²