Question

. Сократите дробь: x² - 8x-9 x-9​

Answer 1

Ответ:

(x²-8x-9)/(x-9)=(x+1)(x-9)/(x-9)=x+1

x²-8x-9=(x+1)(x-9)

D=64+36=100; x1=(8-10)/2=-1; x2=(8+10)/2=9