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30x³ -15x²y
b. (2x -2) (x +5)
2x² +10x -2x -10
2x² +8x -10
3. (x -5)(x² -4x +20)
x³ -4x² +20x -5x² +20x -100
x³ -4x² -5x² +20x +20x -100
x³ -9x² +40x -100