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a) (x+1)²-2(2x-3)²=x²+2x+1-2(4x²-12x+9)=x²+2x+1-8x²+24x-18=-7x²+26x-17
b) (√3x+1)(√3x-1)-3(x+2)²=9x²-1-3(x²+4x+4)=9x²-1-3x²-12x-12=3x²-12x-13
zad 2.
a) x²(x-3)-4(x-3)=x³-3x²-4x+12
b) (2x-y)²-4y²=4x²-4xy+y²-4y²=4x²-3y²-4xy