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Pertanyaan

Diketahui a = 2 i − j ​ + 3 k , b = − i + 2 j ​ + 3 k dan c = − i + 5 j ​ + 6 k . Jika berlaku hubungan 3 x = 2 b − 3 a + c maka vektor x adalah ...

Diketahui  dan . Jika berlaku hubungan  maka vektor  adalah ...

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E. Lestari

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Jawaban terverifikasi

Jawaban

jawaban yang tepat adalah D.

jawaban yang tepat adalah D.

Pembahasan

Diketahui vektor dan Mencari vektor dari hubungan : Jadi, . Dengan demikian, jawaban yang tepat adalah D.

Diketahui vektor begin mathsize 14px style a with rightwards arrow on top equals 2 i with hat on top minus j with hat on top plus 3 k with hat on top comma space b with rightwards arrow on top equals negative i with hat on top plus 2 j with hat on top plus 3 k with hat on top end style dan begin mathsize 14px style c with rightwards arrow on top equals negative i with hat on top plus 5 j with hat on top plus 6 k with hat on top end style

Mencari vektor begin mathsize 14px style x with rightwards arrow on top end style dari hubungan begin mathsize 14px style 3 x with rightwards arrow on top equals 2 b with rightwards arrow on top minus 3 a with rightwards arrow on top plus c with rightwards arrow on top end style:

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell 3 x with rightwards arrow on top end cell equals cell 2 b with rightwards arrow on top minus 3 a with rightwards arrow on top plus c with rightwards arrow on top end cell row cell 3 x with rightwards arrow on top end cell equals cell 2 open parentheses table row cell negative 1 end cell row cell thin space 2 end cell row cell thin space 3 end cell end table close parentheses minus 3 open parentheses table row 2 row cell thin space minus 1 end cell row cell thin space 3 end cell end table close parentheses plus open parentheses table row cell negative 1 end cell row cell thin space 5 end cell row cell thin space 6 end cell end table close parentheses end cell row cell 3 x with rightwards arrow on top end cell equals cell open parentheses table row cell negative 2 end cell row cell thin space 4 end cell row cell thin space 6 end cell end table close parentheses minus open parentheses table row 6 row cell thin space minus 3 end cell row cell thin space 9 end cell end table close parentheses plus open parentheses table row cell negative 1 end cell row cell thin space 5 end cell row cell thin space 6 end cell end table close parentheses end cell row cell 3 x with rightwards arrow on top end cell equals cell open parentheses table row cell negative 9 end cell row 12 row 3 end table close parentheses end cell row cell x with rightwards arrow on top end cell equals cell 1 third open parentheses table row cell negative 9 end cell row 12 row 3 end table close parentheses end cell row cell x with rightwards arrow on top end cell equals cell open parentheses table row cell negative 3 end cell row 4 row 1 end table close parentheses end cell end table end style 

Jadi, begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell x with rightwards arrow on top end cell end table table attributes columnalign right center left columnspacing 0px end attributes row blank equals blank end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell open parentheses table row cell negative 3 end cell row 4 row 1 end table close parentheses end cell end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank space end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank atau end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank space end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell x with rightwards arrow on top end cell end table table attributes columnalign right center left columnspacing 0px end attributes row blank equals blank end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank minus end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank 3 end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell i with hat on top end cell end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank plus end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank 4 end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell j with hat on top end cell end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank plus end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell k with hat on top end cell end table end style.

Dengan demikian, jawaban yang tepat adalah D.

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