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= 20y -100
B) (x+5) x (5x-1)
= 5x² -x + 25x -5
= 5x² + 24x -5
C) (7-2x) x (2x-7)
= 14x -49 -4x² + 14x
= -4x² + 28x -49
= 4x² - 28x + 49