x² - 6x = 0
x₁ = 0, x₂ = 6
x² - 25 = 0
x₁ = 5, x₂ = -5
x² - 7x + 10 = 0
x₁ = 2, x₂ = 5
3x - 7 = 11
x = 6
2x - 5 > 3
x > 4, tj. x ∈ (4, ∞)
3x² + 12x = 0
x₁ = 0, x₂ = -4
3x² - 48 = 0
x₁ = 4, x₂ = -4
x² + 3x - 18 = 0
x₁ = 3, x₂ = -6
5x + 4 = 2x - 5
x = -3
4 - 3x ≤ 10
x ≥ -2, tj. x ∈ <-2, ∞)
5x² - 7x = 0
x₁ = 0, x₂ = 7/5 = 1,4
2x² + 18 = 0
Nemá řešení v R
x² - x - 20 = 0
x₁ = 5, x₂ = -4
4(x - 2) = 2(x + 5)
x = 9
(x - 1)/3 ≥ (x + 2)/2
x ≤ -8, tj. x ∈ (-∞, -8>
2x(x - 4) = x² - 3x
x₁ = 0, x₂ = 5
4x² - 27 = 0
x = ± (3√3)/2
x² + 8x + 12 = 0
x₁ = -2, x₂ = -6
(x + 2)/3 = (x - 1)/2
x = 7
(x² - 9) / (x² - 4) ≤ 0
x ∈ <-3, -2) ∪ (2, 3>
3x(x - 2) = (x - 2)(x + 2) + 4
x₁ = 0, x₂ = 3
(x + 3)(x - 3) = 2x² - 25
x₁ = 4, x₂ = -4
x² + px + q = 0, je-li x₁ = -5 a x₂ = 3
x² + 2x - 15 = 0
(2x - 1)/4 - (x - 3)/2 = 2
Nemá řešení (5 = 8)
(x² - 2x - 15) / (x² - 1) ≤ 0
x ∈ <-3, -1) ∪ (1, 5>