Wykonaj działania :
a) -5x^2 + 3x(x-1) + (2x-1)( x+3)
b) ( 2a-b) (a+3b) - ( a-4b) (2a+b)
a) -5x^2 + 3x^2 - 3 + 2x^2 + 6x -x - 3 = 5x - 6
b) 2a^2 + 6ab - ab + 3b^2 - 2a^2 +ab - 8ab - 4b^2 = -ab - b^2
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a) -5x^2 + 3x^2 - 3 + 2x^2 + 6x -x - 3 = 5x - 6
b) 2a^2 + 6ab - ab + 3b^2 - 2a^2 +ab - 8ab - 4b^2 = -ab - b^2