Mathematics, 18.07.2019 01:30 ErikaS7494
Given: a = (4, 0) b = (-6, 10) unit vector in the direction of ab
Answers: 1
![\bf \begin{cases} A=(4,0)\\ B=(-6,10) \end{cases}\qquad B-A\implies (-6-4~~,~~10-0)\implies \stackrel{\textit{component form}}{(-10,10)=AB} \\\\[-0.35em] ~\dotfill\\\\ ||AB||\implies \sqrt{(-10)^2+(10)^2}\implies \sqrt{100+100}\implies \sqrt{2(100)} \\\\\\ \sqrt{2(10^2)}\implies 10\sqrt{2} \\\\[-0.35em] ~\dotfill](/tpl/images/0102/2245/fbd20.png)
![\bf \stackrel{\textit{unit vector}}{\cfrac{AB}{||AB||}}\implies \cfrac{(-10,10)}{10\sqrt{2}}\implies \left( \cfrac{\stackrel{-1}{~~\begin{matrix} -10 \\[-0.7em]\cline{1-1}\\[-5pt]\end{matrix}~~}}{~~\begin{matrix} 10 \\[-0.7em]\cline{1-1}\\[-5pt]\end{matrix}~~\sqrt{2}}~,~\cfrac{~~\begin{matrix} 10 \\[-0.7em]\cline{1-1}\\[-5pt]\end{matrix}~~}{~~\begin{matrix} 10 \\[-0.7em]\cline{1-1}\\[-5pt]\end{matrix}~~\sqrt{2}} \right) \implies \left(\cfrac{-1}{\sqrt{2}}~,~\cfrac{1}{\sqrt{2}} \right)](/tpl/images/0102/2245/ecd6e.png)
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Given: a = (4, 0) b = (-6, 10) unit vector in the direction of ab...
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