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20y -100
b. (x +5) (5x -1)
5x² -x +25x -5
5x² +24x -5
c. (7 -2x) (2x -7)
14x -49 -4x² +14x
14x +14x -4x² -49
28x -4x² -49
b.5x²-x+25x²-5 = 30x² -x-5
c.14x-49-4x²-14x = -49-4x² :D