Question

x^2-9=0 cum o scot pe aceasta ecutie?

Answer 1

x^2-9=0

x^2=9

x=rad9

x=rad3^2

x=3

x=rad(-3)^2

x=-3

Answer 2

x^2-9=0
x^2=9
x=(+-)rad9
x=(+-)3
x1=3
x2=-3