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Jika a + b = a dan u + v = 0 , maka ....

Jika  dan , maka ....

  1. begin mathsize 14px style straight b with rightwards arrow on top equals 0 with rightwards arrow on top end style dan begin mathsize 14px style straight v with rightwards arrow on top equals 0 with rightwards arrow on top end style 

  2. begin mathsize 14px style straight b with rightwards arrow on top equals 0 with rightwards arrow on top end style dan begin mathsize 14px style straight v with rightwards arrow on top equals negative straight u with rightwards arrow on top end style 

  3. begin mathsize 14px style straight b with rightwards arrow on top equals negative straight a with rightwards arrow on top end style dan begin mathsize 14px style straight v with rightwards arrow on top equals 0 with rightwards arrow on top end style 

  4. begin mathsize 14px style straight b with rightwards arrow on top equals negative straight a with rightwards arrow on top end style dan begin mathsize 14px style straight v with rightwards arrow on top equals negative straight u with rightwards arrow on top end style

  5. begin mathsize 14px style straight b with rightwards arrow on top equals negative straight u with rightwards arrow on top end style dan begin mathsize 14px style straight v with rightwards arrow on top equals negative straight a with rightwards arrow on top end style

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dan .

undefined dan  .

Pembahasan

Perhatikan bahwa vektor memiliki unsur identitas penjumlahan, yaitu , yang memenuhi Karena pada soal diketahui , maka haruslah . Kemudian vektor memiliki invers penjumlahan, yaitu , yang memenuhi Sehingga didapat pula bahwa Karena pada soal diketahui , maka . Sehingga dan .

Perhatikan bahwa vektor memiliki unsur identitas penjumlahan, yaitu begin mathsize 14px style 0 with rightwards arrow on top end style, yang memenuhi

begin mathsize 14px style straight a with rightwards arrow on top plus 0 with rightwards arrow on top equals straight a with rightwards arrow on top 0 with rightwards arrow on top plus straight a with rightwards arrow on top equals straight a with rightwards arrow on top end style

Karena pada soal diketahui undefined, maka haruslah undefined.

 

Kemudian vektor begin mathsize 14px style straight a with rightwards arrow on top end style memiliki invers penjumlahan, yaitu begin mathsize 14px style negative straight a with rightwards arrow on top end style, yang memenuhi

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell straight a with rightwards arrow on top plus open parentheses negative straight a with rightwards arrow on top close parentheses end cell equals cell 0 with rightwards arrow on top end cell row cell negative straight a with rightwards arrow on top plus straight a with rightwards arrow on top end cell equals cell 0 with rightwards arrow on top end cell end table end style

Sehingga didapat pula bahwa

begin mathsize 14px style straight u with rightwards arrow on top plus open parentheses negative straight u with rightwards arrow on top close parentheses equals 0 with rightwards arrow on top end style

Karena pada soal diketahui undefined, maka undefined.

 

Sehingga undefined dan  .

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