Odpowiedź:
1)
(x +8)( - x - 5)(2x - 10) = 0
x+8 = 0 ∨ - x - 5 = 0 ∨ 2x - 10 = 0
x = -8 ∨ - x = 5 ∨ 2x = 10
x = - 8 ∨ x = -5 ∨ x = 10/2 = 5
x = { - 8 , - 5 , 5 }
2)
x² - 36 = 0
(x - 6)(x +6) = 0
x - 6 = 0 ∨ x+ 6 = 0
x = 6 ∨ x = - 6
x = { - 6 , 6 }
3)
x² - x = 0
x(x - 1) = 0
x = 0 ∨ x - 1 = 0
x = 0 ∨x = 1
x = { 0 , 1 }
4)
x² - 4x + 4 = 0
a = 1 , b = - 4 , c = 4
Δ = b² - 4ac = (- 4)² - 4 * 1 * 4 = 16 - 16 = 0
x₁ = x₂ = - b/2a = 4/2 = 2
x = 2
