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Pertanyaan

Diketahui titik . Vektor a = PQ ​ dan vektor b = QR ​ + PR . Maka nilai a ⋅ b adalah ….

Diketahui titik begin mathsize 14px style straight P open parentheses negative 3 comma space minus 1 comma space minus 5 close parentheses comma blank straight Q open parentheses negative 1 , space 2 comma space 0 close parentheses comma space straight R open parentheses 1 comma space 2 comma space minus 2 close parentheses end style. Vektor  dan vektor

. Maka nilai  adalah ….

  1. 12space 

  2. 14undefined 

  3. 17undefined 

  4. 21undefined 

  5. 26undefined 

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S. Nur

Master Teacher

Jawaban terverifikasi

Jawaban

pilihan jawaban yang tepat adalah E.

pilihan jawaban yang tepat adalah E.

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Pembahasan

Diketahui: Ditanya ? Perhatikan perhitungan berikut! Dengan demikian, diperoleh perhitungan berikut ini. Jadi, pilihan jawaban yang tepat adalah E.

Diketahui: 

begin mathsize 14px style straight P open parentheses negative 3 comma space minus 1 comma space minus 5 close parentheses comma blank straight Q open parentheses negative 1 , space 2 comma space 0 close parentheses comma space straight R open parentheses 1 , space 2 comma space minus 2 close parentheses straight a with rightwards arrow on top equals PQ with rightwards arrow on top comma space straight b with rightwards arrow on top equals QR with rightwards arrow on top plus PR with rightwards arrow on top end style 

Ditanya undefined?
Perhatikan perhitungan berikut!

table attributes columnalign right center left columnspacing 0px end attributes row cell straight a with rightwards arrow on top end cell equals cell PQ with rightwards arrow on top equals straight Q minus straight P end cell row cell       end cell equals cell blank open square brackets table row cell negative 1 end cell row 2 row 0 end table close square brackets minus open square brackets table row cell negative 3 end cell row cell negative 1 end cell row cell negative 5 end cell end table close square brackets end cell row blank equals cell open square brackets table row cell negative 1 plus 3 end cell row cell 2 plus 1 end cell row cell 0 plus 5 end cell end table close square brackets end cell row blank equals cell open square brackets table row 2 row 3 row 5 end table close square brackets end cell row blank blank blank row cell straight b with rightwards arrow on top end cell equals cell QR with rightwards arrow on top plus PR with rightwards arrow on top equals open parentheses straight R minus straight Q close parentheses plus left parenthesis straight R minus straight P right parenthesis end cell row cell       end cell equals cell open parentheses blank open square brackets table row 1 row 2 row cell negative 2 end cell end table close square brackets minus open square brackets table row cell negative 1 end cell row 2 row 0 end table close square brackets close parentheses plus open parentheses blank open square brackets table row 1 row 2 row cell negative 2 end cell end table close square brackets minus open square brackets table row cell negative 3 end cell row cell negative 1 end cell row cell negative 5 end cell end table close square brackets close parentheses end cell row blank equals cell blank open square brackets table row 2 row 0 row cell negative 2 end cell end table close square brackets plus open square brackets table row 4 row 3 row 3 end table close square brackets end cell row blank equals cell open square brackets table row 6 row 3 row 1 end table close square brackets end cell row blank blank blank row blank blank blank end table   

Dengan demikian, diperoleh perhitungan berikut ini.

table attributes columnalign right center left columnspacing 0px end attributes row cell straight a with rightwards arrow on top times straight b with rightwards arrow on top end cell equals cell open square brackets table row 2 row 3 row 5 end table close square brackets times open square brackets table row 6 row 3 row 1 end table close square brackets end cell row blank equals cell 2 open parentheses 6 close parentheses plus 3 open parentheses 3 close parentheses plus 5 open parentheses 1 close parentheses end cell row blank equals cell 12 plus 9 plus 5 end cell row blank equals 26 end table  

Jadi, pilihan jawaban yang tepat adalah E.

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