Diketahui a=−2i+4j, b=−6j, dan vektor c=−3i+5j. Tentukan hasil dari:  b. c⋅b

Pertanyaan

Diketahui begin mathsize 14px style a with rightwards arrow on top equals negative 2 i plus 4 j comma space b with rightwards arrow on top equals negative 6 j end style, dan vektor begin mathsize 14px style c with rightwards arrow on top equals negative 3 i plus 5 j end style. Tentukan hasil dari: 

b. begin mathsize 14px style c with rightwards arrow on top times b with rightwards arrow on top end style 

  1. ...  

  2. ...  

L. Rante

Master Teacher

Mahasiswa/Alumni Universitas Negeri Makassar

Jawaban terverifikasi

Jawaban

 begin mathsize 14px style c with rightwards arrow on top times b with rightwards arrow on top equals negative 30 end style

Pembahasan

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell c with rightwards arrow on top end cell equals cell negative 3 i plus 5 j end cell row blank equals cell open parentheses table row cell negative 3 end cell row 5 end table close parentheses end cell row blank blank blank row cell b with rightwards arrow on top end cell equals cell negative 6 j end cell row blank equals cell open parentheses table row 0 row cell negative 6 end cell end table close parentheses end cell row blank blank blank row cell c with rightwards arrow on top times b with rightwards arrow on top end cell equals cell open parentheses table row cell negative 3 end cell row 5 end table close parentheses times open parentheses table row 0 row cell negative 6 end cell end table close parentheses end cell row blank equals cell open parentheses negative 3 close parentheses times 0 plus 5 times open parentheses negative 6 close parentheses end cell row blank equals cell 0 minus 30 end cell row blank equals cell negative 30 end cell end table end style 

Jadi begin mathsize 14px style c with rightwards arrow on top times b with rightwards arrow on top equals negative 30 end style

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