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Magnitude of $$$\left\langle -1, -5, 0\right\rangle$$$
Your Input
Find the magnitude (length) of $$$\mathbf{\vec{u}} = \left\langle -1, -5, 0\right\rangle$$$.
Solution
The vector magnitude of a vector is given by the formula $$$\mathbf{\left\lvert\vec{u}\right\rvert} = \sqrt{\sum_{i=1}^{n} \left|{u_{i}}\right|^{2}}$$$.
The sum of squares of the absolute values of the coordinates is $$$\left|{-1}\right|^{2} + \left|{-5}\right|^{2} + \left|{0}\right|^{2} = 26$$$.
Therefore, the magnitude of the vector is $$$\mathbf{\left\lvert\vec{u}\right\rvert} = \sqrt{26}$$$.
Answer
The magnitude is $$$\sqrt{26}\approx 5.099019513592785$$$A.