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Pertanyaan

Diketahui a = 3 i − j ​ dan b = 2 i + 13 j ​ dan c = − 2 i − 8 j ​ . tentukanlah ∣ ∣ ​ a + b + c ∣ ∣ ​ ?

Diketahui . tentukanlah ?

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S. Indah

Master Teacher

Mahasiswa/Alumni Universitas Lampung

Jawaban terverifikasi

Jawaban

hasil dari adalah 5.

hasil dari open vertical bar a with rightwards arrow on top plus b with rightwards arrow on top plus c with rightwards arrow on top close vertical bar adalah 5.

Pembahasan

Diketahui: Ditanya: ? Jawab: Ingat! Sehingga: Dengan demikian, hasil dari adalah 5.

Diketahui:

a with rightwards arrow on top equals 3 top enclose i minus top enclose j

b with rightwards arrow on top equals 2 straight i with rightwards arrow on top plus 13 straight j with rightwards arrow on top

straight c with rightwards arrow on top equals negative 2 straight i with rightwards arrow on top minus 8 straight j with rightwards arrow on top

Ditanya: open vertical bar a with rightwards arrow on top plus b with rightwards arrow on top plus c with rightwards arrow on top close vertical bar?

Jawab:

Ingat!

table attributes columnalign right center left columnspacing 0px end attributes row cell v with rightwards arrow on top end cell equals cell x i with rightwards arrow on top plus y j with rightwards arrow on top end cell row cell open vertical bar v with rightwards arrow on top close vertical bar end cell equals cell square root of x squared plus y squared end root end cell end table

Sehingga: 

table attributes columnalign right center left columnspacing 0px end attributes row cell a with rightwards arrow on top plus b with rightwards arrow on top plus c with rightwards arrow on top end cell equals cell open parentheses table row 3 row cell negative 1 end cell end table close parentheses plus open parentheses table row 2 row 13 end table close parentheses plus open parentheses table row cell negative 2 end cell row cell negative 8 end cell end table close parentheses end cell row blank equals cell open parentheses table row 3 row 4 end table close parentheses end cell row blank equals cell 3 i with rightwards arrow on top plus 4 j with rightwards arrow on top end cell row blank blank blank row cell open vertical bar a with rightwards arrow on top plus b with rightwards arrow on top plus c with rightwards arrow on top close vertical bar end cell equals cell square root of 3 squared plus 4 squared end root end cell row blank equals cell square root of 9 plus 16 end root end cell row blank equals cell square root of 25 end cell row blank equals 5 end table

Dengan demikian, hasil dari open vertical bar a with rightwards arrow on top plus b with rightwards arrow on top plus c with rightwards arrow on top close vertical bar adalah 5.

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