<p>Pertama tentukan panjang vektor <img align="middle" alt="begin mathsize 14px style open vertical bar p with rightwards arrow on top close vertical bar equals square root of left parenthesis negative 6 right parenthesis squared plus left parenthesis negative 8 right parenthesis squared end root equals 10 end style" class="Wirisformula" data-mathml="«math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mstyle mathsize=¨14px¨»«mrow»«mfenced open=¨|¨ close=¨|¨»«mover»«mi»p«/mi»«mo»§#8594;«/mo»«/mover»«/mfenced»«mo»=«/mo»«msqrt»«msup»«mrow»«mo»(«/mo»«mo»-«/mo»«mn»6«/mn»«mo»)«/mo»«/mrow»«mn»2«/mn»«/msup»«mo»+«/mo»«msup»«mrow»«mo»(«/mo»«mo»-«/mo»«mn»8«/mn»«mo»)«/mo»«/mrow»«mn»2«/mn»«/msup»«/msqrt»«mo»=«/mo»«mn»10«/mn»«/mrow»«/mstyle»«/math»" height="20" role="math" src="data:image/png;base64,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" style="max-width: none; vertical-align: -3px;" width="177" />. Vektor satuan nya adalah&nbsp; <img align="middle" alt="begin mathsize 14px style p with hat on top equals fraction numerator p with rightwards arrow on top over denominator open vertical bar p with rightwards arrow on top close vertical bar end fraction equals fraction numerator negative 6 i minus 8 j over denominator 10 end fraction equals negative 3 over 5 i minus 4 over 5 j
end style" class="Wirisformula" data-mathml="«math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mstyle mathsize=¨14px¨»«mrow»«mover»«mi»p«/mi»«mo»^«/mo»«/mover»«mo»=«/mo»«mfrac»«mover»«mi»p«/mi»«mo»§#8594;«/mo»«/mover»«mfenced open=¨|¨ close=¨|¨»«mover»«mi»p«/mi»«mo»§#8594;«/mo»«/mover»«/mfenced»«/mfrac»«mo»=«/mo»«mfrac»«mrow»«mo»-«/mo»«mn»6«/mn»«mi»i«/mi»«mo»-«/mo»«mn»8«/mn»«mi»j«/mi»«/mrow»«mn»10«/mn»«/mfrac»«mo»=«/mo»«mo»-«/mo»«mfrac»«mn»3«/mn»«mn»5«/mn»«/mfrac»«mi»i«/mi»«mo»-«/mo»«mfrac»«mn»4«/mn»«mn»5«/mn»«/mfrac»«mi»j«/mi»«mspace linebreak=¨newline¨/»«/mrow»«/mstyle»«/math»" height="39" role="math" src="data:image/png;base64,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" style="max-width: none; vertical-align: -11px;" width="212" /></p>


<p>Vektor satuan dari <img align="middle" alt="begin mathsize 14px style p with rightwards arrow on top equals negative 6 i minus 8 j end style" class="Wirisformula" data-mathml="«math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mstyle mathsize=¨14px¨»«mrow»«mover»«mi»p«/mi»«mo»§#8594;«/mo»«/mover»«mo»=«/mo»«mo»-«/mo»«mn»6«/mn»«mi»i«/mi»«mo»-«/mo»«mn»8«/mn»«mi»j«/mi»«/mrow»«/mstyle»«/math»" height="17" role="math" src="data:image/png;base64,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" style="max-width: none; vertical-align: -3px;" width="82" /> adalah...</p>


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