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Pertanyaan

Diberikan vektor posisi dari titik P dan Q terhadap titik O, p ​ = 9 a − 4 b , dan q ​ = − 3 a − b maka vektor PQ ​ adalah ....

Diberikan vektor posisi dari titik P dan Q terhadap titik O, , dan  maka vektor  adalah ....

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P. Afrisno

Master Teacher

Mahasiswa/Alumni Universitas Sebelas Maret

Jawaban terverifikasi

Jawaban

diperoleh .

diperoleh table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell PQ 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 12 end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell a with rightwards arrow 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 3 end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell b with rightwards arrow on top end cell end table

Pembahasan

Jika diberikan vektor posisi dari titik P dan Q terhadap O berturut-turut dan maka dapat ditentukan vektor sebagai berikut. Diketahui: Sehingga diperoleh: Dengan demikian, diperoleh .

Jika diberikan vektor posisi dari titik P dan Q terhadap O berturut-turut p with rightwards arrow on top equals x subscript 1 i with hat on top plus y subscript 1 j with hat on top dan q with rightwards arrow on top equals x subscript 2 i with hat on top plus y subscript 2 j with hat on top maka dapat ditentukan vektor PQ with rightwards arrow on top sebagai berikut.

table attributes columnalign right center left columnspacing 0px end attributes row cell PQ with rightwards arrow on top end cell equals cell q with rightwards arrow on top minus p with rightwards arrow on top end cell row blank equals cell open parentheses x subscript 2 minus x subscript 1 close parentheses i with hat on top plus open parentheses y subscript 2 minus y subscript 1 close parentheses j with hat on top end cell end table 

Diketahui:

table attributes columnalign right center left columnspacing 0px end attributes row cell p with rightwards arrow on top end cell equals cell 9 a with rightwards arrow on top minus 4 b with rightwards arrow on top end cell row cell q with rightwards arrow on top end cell equals cell negative 3 a with rightwards arrow on top minus b with rightwards arrow on top end cell end table 

Sehingga diperoleh:

table attributes columnalign right center left columnspacing 0px end attributes row cell PQ with rightwards arrow on top end cell equals cell q with rightwards arrow on top minus p with rightwards arrow on top end cell row blank equals cell open parentheses negative 3 a with rightwards arrow on top minus b with rightwards arrow on top close parentheses minus open parentheses 9 a with rightwards arrow on top minus 4 b with rightwards arrow on top close parentheses end cell row blank equals cell open parentheses negative 3 minus 9 close parentheses a with rightwards arrow on top plus open parentheses negative 1 plus 4 close parentheses b with rightwards arrow on top end cell row blank equals cell 12 a with rightwards arrow on top plus 3 b with rightwards arrow on top end cell end table 

Dengan demikian, diperoleh table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell PQ 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 12 end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell a with rightwards arrow 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 3 end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell b with rightwards arrow on top end cell end table

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