Question

5. Сократите дробь: x²-8x-9/х-9​

Answer 1

(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