distrassed
Oblicz : a) (2x - 5y) (x-3y) = b) (4a - 5c) (-c+a) = c) (-a + b + c) (2a + b) = d) (-2x - 7y) (x + y) = e) (-xy + 2c) (-5xy + c) = f) (-10a + 1) (-a + 5) =
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a) (2x - 5y) (x-3y) = =2x^2-11xy+15y^2 b) (4a - 5c) (-c+a) = =-4ac+4a^2+5c^2-5ac=4a^2+5c^2-9ac c) (-a + b + c) (2a + b) = =-2a^2-ab+2ab+b^2+2ac+bc d) (-2x - 7y) (x + y) = =-2x^2-9xy-7y^2 e) (-xy + 2c) (-5xy + c) = =5x^2y^2-11xyc+2c^2 f) (-10a + 1) (-a + 5) = =10a^2-51a+5
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