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Pertanyaan

Perhatikan gambar berikut Jika PQ = 3 2 ​ PR , maka vektor posisi titik R terhadap titik O adalah ....

Perhatikan gambar berikut

Jika , maka vektor posisi titik R terhadap titik O adalah ....

  1. begin mathsize 14px style 1 half open parentheses 3 q with rightwards arrow on top minus p with rightwards arrow on top close parentheses end style

  2. begin mathsize 14px style 1 half open parentheses q with rightwards arrow on top minus 3 p with rightwards arrow on top close parentheses end style

  3. begin mathsize 14px style 1 half open parentheses 3 p with rightwards arrow on top minus q with rightwards arrow on top close parentheses end style

  4. begin mathsize 14px style 1 fourth open parentheses q with rightwards arrow on top plus 3 p with rightwards arrow on top close parentheses end style

  5. begin mathsize 14px style 1 fourth open parentheses 3 q with rightwards arrow on top plus p with rightwards arrow on top close parentheses end style 

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Jawaban terverifikasi

Jawaban

vektor posisi titik R terhadap titik O adalah .

vektor posisi titik R terhadap titik O adalah begin mathsize 14px style r with rightwards arrow on top equals 1 half open parentheses 3 q with rightwards arrow on top minus p with rightwards arrow on top close parentheses end style .

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Pembahasan

Perhatikan gambar berikut Misalkan = menyatakan vektor posisi titik R terhadap titik O. Perhatikan bahwa . Sehingga . Maka PQ : PR = 2 : 3. Sehingga jika PQ = 2x, maka PR = 3x. Sehingga PQ : QR = 2 : 1. Maka Sehingga vektor posisi titik R terhadap titik O adalah .

Perhatikan gambar berikut

Misalkan begin mathsize 14px style stack O R with rightwards arrow on top end style = begin mathsize 14px style r with rightwards arrow on top end style menyatakan vektor posisi titik R terhadap titik O.

Perhatikan bahwa begin mathsize 14px style P Q equals 2 over 3 P R end style. Sehingga begin mathsize 14px style fraction numerator P Q over denominator P R end fraction equals 2 over 3 end style. Maka PQ : PR = 2 : 3.

Sehingga jika PQ = 2x, maka PR = 3x.

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell P R end cell equals cell 3 x end cell row cell P Q plus Q R end cell equals cell 3 x end cell row cell 2 x plus Q R end cell equals cell 3 x end cell row cell Q R end cell equals cell 3 x minus 2 x end cell row cell Q R end cell equals x end table end style

Sehingga PQ : QR = 2 : 1.

Maka

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell q with rightwards arrow on top end cell equals cell fraction numerator 2 r with rightwards arrow on top plus p with rightwards arrow on top over denominator 2 plus 1 end fraction end cell row cell q with rightwards arrow on top end cell equals cell fraction numerator 2 r with rightwards arrow on top plus p with rightwards arrow on top over denominator 3 end fraction end cell row cell 3 q with rightwards arrow on top end cell equals cell 2 r with rightwards arrow on top plus p with rightwards arrow on top end cell row cell 3 q with rightwards arrow on top minus p with rightwards arrow on top end cell equals cell 2 r with rightwards arrow on top end cell row cell r with rightwards arrow on top end cell equals cell 1 half open parentheses 3 q with rightwards arrow on top minus p with rightwards arrow on top close parentheses end cell end table end style

Sehingga vektor posisi titik R terhadap titik O adalah begin mathsize 14px style r with rightwards arrow on top equals 1 half open parentheses 3 q with rightwards arrow on top minus p with rightwards arrow on top close parentheses end style .

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