Zapisz w postaci jak najrostszej sumy algebraicznej.
a) (x+3)(x-7)
b) -3(2x-1)(x+6)
c)-(y-1)(2y+4)
d) 2a²-(a+6)(2a-1)
e) 3(x²-1)-(x-3)(x+2)
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a)(x+3)(x-7)=x²-7x+3x-21=x²-4x-21
b)-3(2x-1)(x+6)=-6x+3+7x-18=13x-15
c)-(y-1)(2y+4)=-y+1-2y²+4=y-2y²+5
d)2a²-(a+6)(2a-1)=2a²-2a²-a+12a-6=11a-6
e)3(x²-1)-(x-3)(x+2)=3x²-3²-x+3+x²+2x-3x-6