check my math? doing vectors. llvll= -5^+7^ llvll= 25 + 49 llvll= 74 llvll= 8.6

Question

+3

849

2

check my math? doing vectors.
llvll= -5^+7^
llvll= 25 + 49
llvll= 74
llvll= 8.6

Guest Jun 10, 2014

+26396

+7

Best Answer

$\vec{v} = \begin{pmatrix}-5\\7 \end{pmatrix} \| v\| = \sqrt{(-5)^2+7^2}= \sqrt{25+49}= \sqrt{74} \approx 8.60$

heureka Jun 10, 2014

heureka · Answer 1 · 2014-06-10T10:20:01

$\vec{v} = \begin{pmatrix}-5\\7 \end{pmatrix} \| v\| = \sqrt{(-5)^2+7^2}= \sqrt{25+49}= \sqrt{74} \approx 8.60$

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CPhill · Answer 2 · 2014-06-10T12:19:40

Correct answer.....

Let's "clean it up" a little

v = <5,7>

llvll = √(5² + 7²) = √(25 + 49) = √(74) ≈ 8.6

A little better, huh???