25x^2-1=0 корни уравнения

Question

25x^2-1=0 корни уравнения

Answer 1

25x^2=1
x^2=0.04
x1=+0.2; x2=-0.2 

Answer 2

25x^2 - 1 = 0

25x^2 = 1

x^2 = 1/25

x = +- 1/5