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a) 2x-3x²+5-3x+2x²= -x²-x+5
b) -1/4a(4a²-8a+12)= -4/4 a³+8/4 a²-12/4 a= -a³+2a²-3a
c)(x-1)(x²-x+1)=x³-x²+x-x²+x-1=x³-2x²+2x-1
zad2
a)(3x+2y)²=(3x+2y)(3x+2y)=9x²+6xy+6xy+4y²=9x²+4y²+12xy
b)(1/2x-y)²=(1/2x-y)(1/2x-y)=1/4x²-1/2xy-1/2xy+y²=1/4x²+y²-xy
zad3
a) -3x³-4,8=-3*(-1)³-4,8=-3*(-1)-4,8=3-4,8=-1,8