[tex]zad.2\\\\P_{\Delta} =\dfrac{1}{2} \cdot a \cdot h ~~gdzie~~a=2x-2,~~h=2x-4\\\\P_{\Delta} =\dfrac{1}{2} \cdot (2x-2)\cdot (2x-4)\\\\P_{\Delta} =\dfrac{1}{2} \cdot 2 \cdot (x-1)\cdot (2x-4)\\\\P_{\Delta} = (x-1)\cdot (2x-4)\\\\P_{\Delta} =2x^{2} -4x-2x+4\\\\P_{\Delta} =2x^{2} -6x+4\\\\Odp:~~B.~~2x^{2} -6x+4[/tex]
[tex]zad.3\\\\-(4x-3)\cdot (x-2)-(2x+6)\cdot (-2x-1)=- (4x^{2} -8x-3x+6)-(-4x^{2} -2x-12x-6)=-(4x^{2} -11x+6)-(-4x^{2} -14x-6)=-4x^{2} +11x-6+4x^{2} +14x+6=25x\\\\Odp:~~A.~~25x[/tex]
