1) x² - 1,3² = 0
(x - 1,3)(x + 1,3) = 0
x - 1,3 = 0
x₁ = 1,3
x + 1,3 = 0
x₂ = - 1,3
2) 2² - (4x)²= 0
(2 - 4x)(2 + 4x) = 0
2 - 4x = 0
- 4x = - 2
x₁ = 0,5
2 + 4x = 0
4x = - 2
x₂ = - 0,5
3) (5x)² - 10² = 0
(5x - 10)(5x + 10) = 0
5x - 10 = 0
5x = 10
x₁ = 2
5x + 10 = 0
5x = - 10
x₂ = - 2
