1)
2)
Odpowiedź:
2x² + 8x - 10 = 0
a =2 , b = 8 , c = - 10
Δ = b² - 4ac = 8² - 4 * 2 * (- 10) = 64 + 80 = 144
√Δ = √144 = 12
x₁ = (- b - √Δ)/2a = (- 8 - 12)/4 = - 20/4 = - 5
x₂ = (- b + √Δ)/2a = (- 8 + 10)/4 = 2/4 = 1/2
- 5x + 4x² = 0
x(- 5 + 4x) = 0
x = 0 ∨ - 5 + 4x = 0
x = 0 ∨ 4x = 5
x = 0 ∨ x =5/4 = 1 1/4
∨ - znaczy "lub"
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1)
2)
Odpowiedź:
2x² + 8x - 10 = 0
a =2 , b = 8 , c = - 10
Δ = b² - 4ac = 8² - 4 * 2 * (- 10) = 64 + 80 = 144
√Δ = √144 = 12
x₁ = (- b - √Δ)/2a = (- 8 - 12)/4 = - 20/4 = - 5
x₂ = (- b + √Δ)/2a = (- 8 + 10)/4 = 2/4 = 1/2
- 5x + 4x² = 0
x(- 5 + 4x) = 0
x = 0 ∨ - 5 + 4x = 0
x = 0 ∨ 4x = 5
x = 0 ∨ x =5/4 = 1 1/4
∨ - znaczy "lub"