1) -2x(4x-5y+3)=-8х^2+10ху-6х 2) (x+8)(x-3)=х^2-3х+8х-24=х^2+5х-24 3)(x-7)(x+7)=х^2-49 4) (x-5)^2=х^2-10х+25 5)(y+6)^2=у^2+12у+36
1) -2x(4x-5y+3)=-8х^2+10ху-6х 2) (x+8)(x-3)=х^2-3х+8х-24=х^2+5х-24 3)(x-7)(x+7)=х^2-49 4) (x-5)^2=х^2-10х+25 5)(y+6)^2=у^2+12у+36