1x≠-2,x≠-5(x-3)(x+5)=(3x-7)(x+2)x²+5x-3x-15-3x²-6x+7x+14=0-2x²+3x-1=02x²-3x+1=0D=9-8=1x1=(3-1)/4=0,5x2=(3+1)/4=22x≠03x²-7x+4=0D=49-48=1x1=(7-1)/6=1x2=(7+1)/6=4 1/33x≠-4(3x+1)*(x+4)=203x²+12x+x+4-20=03x²+13x-16=0D=169+192=361x1=(-13+19)/6=-1x2=(-13-19)/6=-5 1/34x≠0;x≠-14(x+1)+10*x=3x(x+1)3x²+3x-4x-4-10x=03x²-11x-4=0D=121+48=169x1=(11-13)/6=-1/3x2=(11+13)/6=4