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Question Number 119572 by zakirullah last updated on 25/Oct/20

Commented by bemath last updated on 25/Oct/20

$$\left(i\right)method1$$$$\overrightarrow{a}\parallel \overrightarrow{b}if\overrightarrow{a}\times \overrightarrow{b}=\overrightarrow{0}$$$$\Rightarrow \overrightarrow{a}\times \overrightarrow{b}=\left|\begin{array}{c}-12-3\\ 2-46\end{array}\right|$$$$=(12-12,-6-(-6),4-4)$$$$=(0,0,0)$$

Commented by bemath last updated on 25/Oct/20

$$\left(i\right)method2$$$$\overrightarrow{a}\parallel \overrightarrow{b}if\frac{a_1}{b_1}=\frac{a_2}{b_2}=\frac{a_3}{b_3}$$$$then\frac{-1}{2}=\frac{2}{-4}=\frac{-3}{6}$$

Commented by zakirullah last updated on 25/Oct/20

$$\mathit{y}\mathit{o}\mathit{u}\mathit{a}\mathit{r}\mathit{e}\mathit{t}\mathit{h}\mathit{e}\mathit{g}\mathit{r}\mathit{e}\mathit{a}\mathit{t}!$$

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