Question

1)121-289x^2=0
2)0,89-x^2=0

Answer 1

1. 289x^2=121-0
289x^2=121
x^2= 121289
x= -1117
x=1117

2. x^2= 0,89-0
x^2= 0,89
x= -√0,89
x=√0,89