Zapisz w postaci jak najprostszej 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+3x-7x-21=x²-4x-21
b) -3(2x-1)(x+6)= -3(2x²+12x-x-6)= -6x²-33x+18
c) -(y-1)(2y+4)= -(2y²+4y-2y-4)= -2y²-2y+4
d) 2a²-(a+6)(2a-1)= 2a²-(2a²-a+12a-6)=2a²-2a²-11a+6= -11a+6
e) 3(x²-1)-(x-3)(x+2)= 3x²-3-(x²-x-6)=3x²-3-x²+x+6=2x²-2x+6