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