(x=-8x-9)/(x-9)=(x+1)(х-9)/(x-9)=x+1
x²-8x-9=(x+1)(х-9) D=64+36=100;
х1=(8-10)/2=1; x2=(8+10)/2=9
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(x=-8x-9)/(x-9)=(x+1)(х-9)/(x-9)=x+1
x²-8x-9=(x+1)(х-9) D=64+36=100;
х1=(8-10)/2=1; x2=(8+10)/2=9