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Diberikan 2 vektor dan .Jika vektor w mempunyai panjang satu dan tegak lurus dengan vektor u dan v ,maka w = .... (UM UGM 2017)

Diberikan 2 vektor Error converting from MathML to accessible text. dan Error converting from MathML to accessible text.. Jika vektor  mempunyai panjang satu dan tegak lurus dengan vektor  dan , maka   .... (UM UGM 2017)

  1. begin mathsize 14px style left parenthesis 1 , 0 comma 0 right parenthesis end style 

  2. begin mathsize 14px style open parentheses 1 half square root of 2 comma 1 half square root of 2 comma 0 close parentheses end style  

  3. begin mathsize 14px style open parentheses 1 half square root of 2 comma minus sign 1 half square root of 2 comma 0 close parentheses end style 

  4. begin mathsize 14px style open parentheses negative sign 2 over 3 comma 1 third comma 2 over 3 close parentheses end style 

  5. begin mathsize 14px style open parentheses 2 over 3 comma 1 third comma 2 over 3 close parentheses end style 

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A. Acfreelance

Master Teacher

Jawaban terverifikasi

Jawaban

jawaban yang tepat adalah B.

jawaban yang tepat adalah B.

Pembahasan

Dari soal diketahui bahwa , , , dan . Misalkan . Karena maka Ingat sehingga berlaku . Lalu, ingat sehingga berlaku Selanjutnya eliminasi 2 persamaan Setelah mendapatkan nilai , substitusikan ke salah satu persamaan. Nilai dan , maka Karena maka saat maka atau saat maka . Oleh karena itu adalah atau . Jadi, jawaban yang tepat adalah B.

 Dari soal diketahui bahwa Error converting from MathML to accessible text.Error converting from MathML to accessible text.begin mathsize 14px style vertical line w with rightwards arrow on top vertical line equals 1 end stylebegin mathsize 14px style w with rightwards arrow on top perpendicular u with rightwards arrow on top end style dan begin mathsize 14px style w with rightwards arrow on top perpendicular v with rightwards arrow on top end style .

Misalkan  begin mathsize 14px style w with rightwards arrow on top equals left parenthesis a comma b comma c right parenthesis end style.

Karena begin mathsize 14px style vertical line w with rightwards arrow on top vertical line equals 1 end style maka 

begin mathsize 14px style open vertical bar w with rightwards arrow on top close vertical bar equals square root of a squared plus b squared plus c squared end root equals 1 a squared plus b squared plus c squared equals 1 end style 

Ingat begin mathsize 14px style w with rightwards arrow on top perpendicular u with rightwards arrow on top end style sehingga berlaku  begin mathsize 14px style w with rightwards arrow on top times u with rightwards arrow on top equals 0 end style.

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell w with rightwards arrow on top times u with rightwards arrow on top end cell equals 0 row cell open parentheses a comma b comma c close parentheses times open parentheses 1 comma negative 1 comma 2 close parentheses end cell equals 0 row cell a plus left parenthesis negative b right parenthesis plus 2 c end cell equals 0 row cell a minus b plus 2 c end cell equals 0 end table end style 

Lalu, ingat begin mathsize 14px style w with rightwards arrow on top perpendicular v with rightwards arrow on top end style sehingga berlaku begin mathsize 14px style w with rightwards arrow on top times v with rightwards arrow on top equals 0 end style

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell w with rightwards arrow on top times v with rightwards arrow on top end cell equals 0 row cell open parentheses a comma b comma c close parentheses times open parentheses negative 1 comma 1 comma negative 1 close parentheses end cell equals 0 row cell negative a plus b plus left parenthesis negative c right parenthesis end cell equals 0 row cell negative a plus b minus c end cell equals 0 end table end style 

Selanjutnya eliminasi 2 persamaan

begin mathsize 14px style table attributes columnalign center center center center center center left center end attributes row a minus b plus cell 2 c end cell equals 0 blank row cell negative a end cell plus b minus c equals 0 plus row blank blank blank blank c equals 0 blank end table end style 

Setelah mendapatkan nilai begin mathsize 14px style c equals 0 end style, substitusikan ke salah satu persamaan.

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell a minus b plus 2 left parenthesis 0 right parenthesis end cell equals 0 row cell a minus b end cell equals 0 row a equals b end table end style 

Nilai begin mathsize 14px style a equals b end style dan begin mathsize 14px style c equals 0 end style, maka

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell a squared plus b squared plus c squared end cell equals 1 row cell b squared plus b squared plus 0 squared end cell equals 1 row cell 2 b squared end cell equals 1 row cell b squared end cell equals cell 1 half end cell row b equals cell plus-or-minus square root of 1 half end root end cell row b equals cell plus-or-minus 1 half square root of 2 end cell end table end style 

Karena begin mathsize 14px style a equals b end style maka saat begin mathsize 14px style b equals 1 half square root of 2 end style maka begin mathsize 14px style a equals 1 half square root of 2 end style atau saat begin mathsize 14px style b equals negative 1 half square root of 2 end style maka begin mathsize 14px style a equals negative 1 half square root of 2 end style.

Oleh karena itu begin mathsize 14px style w with rightwards arrow on top end style adalah  begin mathsize 14px style w with rightwards arrow on top equals open parentheses 1 half square root of 2 comma 1 half square root of 2 comma 0 close parentheses end style atau begin mathsize 14px style w with rightwards arrow on top equals left parenthesis negative 1 half square root of 2 comma negative 1 half square root of 2 comma 0 right parenthesis end style.

Jadi, jawaban yang tepat adalah B.

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