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= (25 p² ) (6p- 3q)
= 150p³ - 75 p²q
2. (-2pq) ((3p)² - 4pq - (7q)² )
= -2pq ( 9p² - 4pq - 49q²)
= -18 p³q + 8 p²q² + 98 pq³
3. (x+4) (x+5)
= x² + 5x + 4x + 20
= x² + 9x + 20
4. (4x - 3) (5x -2)
= 20x²- 8x - 15x +6
= 20x² - 23x + 6
5. (3x - y) (x² - xy + y²)
= 3x³ - 3x²y + 3xy² - x²y + xy² - y³
= 3x³ - 4x²y + 4xy² - y³