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2. 60y-5x
3. 100y-10xy-
= (3y + 33y) (15x + 5x)
= 36y + 20x
2). 40y + 20y - 5x
= 60y - 5x
3). (5y +5x).(10-2y)
= (5y.10)+(5y.-2y)+(5x.10)+(5x.-2y)
= 50y + (-10y²) + 50x + (-10xy)
= 50y - 10y² + 50x -10xy