4x² + 6x + k = 0
x₁ = 5 x₂ = ? k = ?
4 * 5² + 6 * 5 + k = 0
100 + 30 + k = 0
k = - 130
4x² + 6x - 130 = 0
2x² + 3x - 65 = 0
D = 3² - 4 * 2 * (- 65) = 9 + 520 = 529 = 23²
k = - 130 , x₂ = - 6,5
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4x² + 6x + k = 0
x₁ = 5 x₂ = ? k = ?
4 * 5² + 6 * 5 + k = 0
100 + 30 + k = 0
k = - 130
4x² + 6x - 130 = 0
2x² + 3x - 65 = 0
D = 3² - 4 * 2 * (- 65) = 9 + 520 = 529 = 23²
k = - 130 , x₂ = - 6,5