Odpowiedź:
1) x² - 25 = 0
x² = 25
x = 5 ∨ x = -5
2) x² - 32 = 0
x² = 32
x = 4√2 ∨ x = -4√2
3) x² - 3 = 0
x² = 3
x = √3 ∨ x = -√3
4) x² - 5x = 0
x(x - 5) = 0
x = 0 ∨ (x - 5) = 0
x = 0 ∨ x = 5
5) 2x² - 6x = 0
x(2x - 6) = 0
x = 0 ∨ x = 3
6) x - x² = 0
x(1 - x) = 0
x = 0 ∨ x = 1
