Question

Найдите корни уравнения х2+8х-9=0

Answer 1

x1+x2= -8

x1*x2= -9

 

x= -9

x= 1

Answer 2

х2+8х-9=0

Д=64+9*4=100

x1= (-8+10)/2=1

x2=(-8-10)/2=-9