Сократите дробь
x2-8x-9 / x2+9x+8

xˇ2 -8x -9
x1+x2 = 8, x1.x2 = -9, x1=9,x2=-1
xˇ2+9x+8
x1+x2 = -9, x1.x2 = 8,x1=-1, x2 = -8
(x-9)(x+1)/(x+1)(x+8) = (x-9)/(x+8)