x^2 - 70x = 0
x(x - 70) = 0
x_1 = 0 x_2 = 70
25 - x^2 = 0
x^2 - 25 = 0
(x-5)(x+5) = 0
x - 5 = 0 x + 5 = 0
x_1 = 5 x_2 = -5
x^2 - 70x = 0
x(x - 70) = 0
x_1 = 0 x_2 = 70
25 - x^2 = 0
x^2 - 25 = 0
(x-5)(x+5) = 0
x - 5 = 0 x + 5 = 0
x_1 = 5 x_2 = -5