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Home » استخدم الصيغة التربيعية: \(x = \frac-b \pm \sqrtb^2 - 4ac2a\) - Dachbleche24

استخدم الصيغة التربيعية: \(x = \frac-b \pm \sqrtb^2 - 4ac2a\) - Dachbleche24

📅 March 9, 2026 👤 scraface

Mar 09, 2026

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📌 2v_3 - 3v_2 = 4, \quad 3v_1 - v_3 = 5, \quad v_2 - 2v_1 = 6.

📌 From the third equation, $v_2 = 6 + 2v_1$. Substituting into the first equation:

📌 2v_3 - 3(6 + 2v_1) = 4 \implies 2v_3 - 18 - 6v_1 = 4 \implies 2v_3 = 22 + 6v_1 \implies v_3 = 11 + 3v_1.

📌 Substitute $v_3$ into the second equation:

📌 3v_1 - (11 + 3v_1) = 5 \implies -11 = 5, \text{ which is a contradiction.}

📌 However, the condition $\mathbf{v} \cdot \mathbf{a} = 0$ implies $v_1 + 2v_2 + 3v_3 = 0$. Substituting $v_2 = 6 + 2v_1$ and $v_3 = 11 + 3v_1$:

📌 v_1 + 2(6 + 2v_1) + 3(11 + 3v_1) = 0 \implies v_1 + 12 + 4v_1 + 33 + 9v_1 = 0 \implies 14v_1 + 45 = 0 \implies v_1 = -\frac{45}{14}.

📌 Then $v_2 = 6 + 2(-\frac{45}{14}) = \frac{84 - 90}{14} = -\frac{6}{14} = -\frac{3}{7}$, and $v_3 = 11 + 3(-\frac{45}{14}) = \frac{154 - 135}{14} = \frac{19}{14}$.

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