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Ubahlah titik-titik P ( − 1 , 3 , 0 ) dan Q ( 1 , 2 , − 2 ) dalam bentuk vektor posisi, vektor satuan dan vektor basis!

Ubahlah titik-titik  dan  dalam bentuk vektor posisi, vektor satuan dan vektor basis!

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M. Mariyam

Master Teacher

Mahasiswa/Alumni Institut Pertanian Bogor

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Diketahui titik-titik dan , maka untuk mengubah dalam bentuk vektor posisi, vektor satuan dan vektor basis, kita bisa menjabarkan satu per satu sebagai berikut: a. suatu vektor yang bertitik awal dan titik ujung di , disebut vektor posisi dari titik suatu vektor yang bertitik awal dan titik ujung di , disebut vektor posisi dari titik b. Vektor satuan dituliskan secara matematis sebagai berikut , misalkan maka sehingga vektor satuan dari adalah danvektor satuan dari adalah , yaitu c. Misalkan , maka vektor basis , sehingga vektor basis adalah dan vektor basis adalah

Diketahui titik-titik begin mathsize 14px style straight P open parentheses negative 1 comma 3 comma 0 close parentheses end style dan begin mathsize 14px style straight Q open parentheses 1 comma 2 comma negative 2 close parentheses end style , maka untuk mengubah dalam bentuk vektor posisi, vektor satuan dan vektor basis, kita bisa menjabarkan satu per satu sebagai berikut:

a. suatu vektor begin mathsize 14px style p with rightwards harpoon with barb upwards on top end style yang bertitik awal Error converting from MathML to accessible text. dan titik ujung di begin mathsize 14px style straight P open parentheses negative 1 comma 3 comma 0 close parentheses end style, disebut vektor posisi dari titik begin mathsize 14px style straight P end style

 begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell p with rightwards harpoon with barb upwards on top end cell equals cell stack O P with rightwards harpoon with barb upwards on top end cell row blank equals cell P minus O end cell row space equals cell open square brackets table row cell negative 1 end cell row 3 row 0 end table close square brackets minus open square brackets table row 0 row 0 row 0 end table close square brackets end cell row blank equals cell open square brackets table row cell negative 1 end cell row 3 row 0 end table close square brackets end cell row blank blank blank row blank blank blank row blank blank cell space space space space space space end cell row blank blank blank end table end style   

    suatu vektor begin mathsize 14px style q with rightwards harpoon with barb upwards on top end style yang bertitik awal Error converting from MathML to accessible text. dan titik ujung di begin mathsize 14px style straight Q open parentheses 1 comma 2 comma negative 2 close parentheses end style, disebut vektor posisi dari titik begin mathsize 14px style straight Q end style

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell q with rightwards harpoon with barb upwards on top end cell equals cell stack O Q with rightwards harpoon with barb upwards on top end cell row blank equals cell Q minus O end cell row blank equals cell 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 0 row 0 row 0 end table close square brackets end cell row blank equals cell open square brackets table row 1 row 2 row cell negative 2 end cell end table close square brackets end cell end table end style 

b. Vektor satuan dituliskan secara matematis sebagai berikut begin mathsize 14px style a with hat on top equals fraction numerator 1 over denominator open double vertical bar a with rightwards harpoon with barb upwards on top close double vertical bar end fraction times a with rightwards harpoon with barb upwards on top end style , misalkan begin mathsize 14px style a with rightwards harpoon with barb upwards on top equals open square brackets table row x row y row z end table close square brackets end style maka begin mathsize 14px style open double vertical bar a with rightwards harpoon with barb upwards on top close double vertical bar equals square root of x squared plus y squared plus z squared end root end style 

sehingga vektor satuan dari undefined adalah begin mathsize 14px style p with hat on top end style dan vektor satuan dari undefined adalah begin mathsize 14px style q with hat on top end style, yaitu

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell p with hat on top end cell equals cell fraction numerator 1 over denominator open double vertical bar p with rightwards harpoon with barb upwards on top close double vertical bar end fraction p with rightwards harpoon with barb upwards on top end cell row blank equals cell fraction numerator 1 over denominator square root of open parentheses negative 1 close parentheses squared plus open parentheses 3 close parentheses squared plus 0 squared end root end fraction open square brackets table row cell negative 1 end cell row 3 row 0 end table close square brackets end cell row blank equals cell fraction numerator 1 over denominator square root of 1 plus 9 plus 0 end root end fraction open square brackets table row cell negative 1 end cell row 3 row 0 end table close square brackets end cell row blank equals cell fraction numerator 1 over denominator square root of 10 end fraction open square brackets table row cell negative 1 end cell row 3 row 0 end table close square brackets end cell row blank equals cell open square brackets table row cell negative fraction numerator 1 over denominator square root of 10 end fraction end cell row cell fraction numerator 3 over denominator square root of 10 end fraction end cell row 0 end table close square brackets end cell end table end style 

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell q with hat on top end cell equals cell fraction numerator 1 over denominator open double vertical bar q with rightwards harpoon with barb upwards on top close double vertical bar end fraction q with rightwards harpoon with barb upwards on top end cell row blank equals cell fraction numerator 1 over denominator square root of 1 squared plus 2 squared plus open parentheses negative 2 close parentheses squared end root end fraction open square brackets table row 1 row 2 row cell negative 2 end cell end table close square brackets end cell row blank equals cell fraction numerator 1 over denominator square root of 1 plus 4 plus 4 end root end fraction open square brackets table row 1 row 2 row cell negative 2 end cell end table close square brackets end cell row blank equals cell fraction numerator 1 over denominator square root of 9 end fraction open square brackets table row 1 row 2 row cell negative 2 end cell end table close square brackets end cell row blank equals cell 1 third open square brackets table row 1 row 2 row cell negative 2 end cell end table close square brackets end cell row blank equals cell open square brackets table row cell 1 third end cell row cell 2 over 3 end cell row cell negative 2 over 3 end cell end table close square brackets end cell end table end style 

c. Misalkan begin mathsize 14px style a with rightwards harpoon with barb upwards on top equals open square brackets table row x row y row z end table close square brackets end style, maka vektor basis  begin mathsize 14px style a with rightwards harpoon with barb upwards on top equals x i with rightwards harpoon with barb upwards on top plus y j with rightwards harpoon with barb upwards on top plus z k with rightwards harpoon with barb upwards on top end style, sehingga 

vektor basis  undefined adalah begin mathsize 14px style negative i with rightwards harpoon with barb upwards on top plus 3 j with rightwards harpoon with barb upwards on top end style dan vektor basis  undefined adalah begin mathsize 14px style i with rightwards harpoon with barb upwards on top plus 2 j with rightwards harpoon with barb upwards on top minus 2 k with rightwards harpoon with barb upwards on top end style 

 

 

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