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20y -100
b. 2a(7a +4b)
14a² +8ab
c. (x +5) (5x -1)
5x² -x +25x -5
5x² +24x -5
d. (7 -2x) (2x -7)
14x -49 -4x² +14x
-4x² +14x +14x -49
-4x² +28x -49
b. 14a2+8ab
c. 5x2+24x-5
d. -4x2+28x-49