Iklan

Iklan

Pertanyaan

Diketahui a ⇀ = 4 i + j + 5 k dan b ⇀ = 2 i + j − 5 k a . a ⇀ + b ⇀ b . a ⇀ − b ⇀ c . a ⇀ − 2 b ⇀ d . 2 a ⇀ ⋅ 3 b ⇀

Diketahui  dan  

  

  

  

  

Iklan

S. Nur

Master Teacher

Jawaban terverifikasi

Jawaban

hasil yang diperoleh adalah ; dan .

hasil yang diperoleh adalah a with rightwards harpoon with barb upwards on top plus b with rightwards harpoon with barb upwards on top equals 6 i plus 2 ja with rightwards harpoon with barb upwards on top minus b with rightwards harpoon with barb upwards on top equals 2 i plus 10 k dan 2 a with rightwards harpoon with barb upwards on top times 3 b with rightwards harpoon with barb upwards on top equals negative 96.

Iklan

Pembahasan

Diketahui dan Ingat kembalijika dan maka Jadi, . Ingat kembali bahwa jika dan maka Jadi, . Ingat kembali bahwa misalkan adalah bilangan skalar dan maka Jadi, . Ingat kembali bahwajika dan maka Jadi, . Dengan demikian, hasil yang diperoleh adalah ; dan .

Diketahui a with rightwards harpoon with barb upwards on top equals 4 i plus j plus 5 k dan b with rightwards harpoon with barb upwards on top equals 2 i plus j minus 5 k 

a. Ingat kembali jika a with rightwards harpoon with barb upwards on top equals a subscript 1 i plus a subscript 2 j plus a subscript 3 k dan b with rightwards harpoon with barb upwards on top equals b subscript 1 i plus b subscript 2 j plus b subscript 3 k maka a with rightwards harpoon with barb upwards on top plus b with rightwards harpoon with barb upwards on top equals left parenthesis a subscript 1 plus b subscript 1 right parenthesis i plus left parenthesis a subscript 2 plus b subscript 2 right parenthesis j plus left parenthesis a subscript 3 plus b subscript 3 right parenthesis k 

table attributes columnalign right center left columnspacing 0px end attributes row cell a with rightwards harpoon with barb upwards on top plus b with rightwards harpoon with barb upwards on top end cell equals cell left parenthesis 4 plus 2 right parenthesis i plus left parenthesis 1 plus 1 right parenthesis j plus left parenthesis 5 plus left parenthesis negative 5 right parenthesis right parenthesis k end cell row blank equals cell 6 i plus 2 j end cell end table 

Jadi, a with rightwards harpoon with barb upwards on top plus b with rightwards harpoon with barb upwards on top equals 6 i plus 2 j.

b. Ingat kembali bahwa jika a with rightwards harpoon with barb upwards on top equals a subscript 1 i plus a subscript 2 j plus a subscript 3 k dan b with rightwards harpoon with barb upwards on top equals b subscript 1 i plus b subscript 2 j plus b subscript 3 k maka a with rightwards harpoon with barb upwards on top minus b with rightwards harpoon with barb upwards on top equals left parenthesis a subscript 1 minus b subscript 1 right parenthesis i plus left parenthesis a subscript 2 minus b subscript 2 right parenthesis j plus left parenthesis a subscript 3 minus b subscript 3 right parenthesis k 

table attributes columnalign right center left columnspacing 0px end attributes row cell a with rightwards harpoon with barb upwards on top minus b with rightwards harpoon with barb upwards on top end cell equals cell left parenthesis 4 minus 2 right parenthesis i plus left parenthesis 1 minus 1 right parenthesis j plus left parenthesis 5 minus left parenthesis negative 5 right parenthesis k end cell row blank equals cell 2 i plus 10 k end cell end table 

Jadi, a with rightwards harpoon with barb upwards on top minus b with rightwards harpoon with barb upwards on top equals 2 i plus 10 k.

c. Ingat kembali bahwa misalkan k adalah bilangan skalar dan a with rightwards harpoon with barb upwards on top equals a subscript 1 i plus a subscript 2 j plus a subscript 3 k maka  k a with rightwards harpoon with barb upwards on top equals k a subscript 1 i plus k a subscript 2 k plus k a subscript 3 k 

table attributes columnalign right center left columnspacing 0px end attributes row cell a with rightwards harpoon with barb upwards on top minus 2 b with rightwards harpoon with barb upwards on top end cell equals cell left parenthesis 4 i plus j plus 5 k right parenthesis minus left parenthesis 2 left parenthesis 2 i plus j minus 5 k right parenthesis right parenthesis end cell row blank equals cell left parenthesis 4 i plus j plus 5 k right parenthesis minus left parenthesis 4 i plus 2 j minus 10 k right parenthesis end cell row blank equals cell left parenthesis 4 minus 4 right parenthesis i plus left parenthesis 1 minus 2 right parenthesis j plus left parenthesis 5 minus left parenthesis negative 10 right parenthesis right parenthesis k end cell row blank equals cell negative j plus 15 k end cell end table 

Jadi, a with rightwards harpoon with barb upwards on top minus 2 b with rightwards harpoon with barb upwards on top equals negative j plus 15 k.

d. Ingat kembali bahwa jika a with rightwards harpoon with barb upwards on top equals a subscript 1 i plus a subscript 2 j plus a subscript 3 k dan b with rightwards harpoon with barb upwards on top equals b subscript 1 i plus b subscript 2 j plus b subscript 3 k maka a with rightwards harpoon with barb upwards on top times b with rightwards harpoon with barb upwards on top equals a subscript 1 times b subscript 1 plus a subscript 2 times b subscript 2 plus a subscript 3 times b subscript 3 

table attributes columnalign right center left columnspacing 0px end attributes row cell 2 a with rightwards harpoon with barb upwards on top times 3 b with rightwards harpoon with barb upwards on top end cell equals cell 2 left parenthesis 4 comma space 1 comma space 5 right parenthesis times 3 left parenthesis 2 comma space 1 comma space minus 5 right parenthesis end cell row blank equals cell left parenthesis 8 comma space 2 comma space 10 right parenthesis times left parenthesis 6 comma space 3 comma space minus 15 right parenthesis end cell row blank equals cell 8 times 6 plus 2 times 3 plus 10 times negative 15 end cell row blank equals cell 48 plus 6 minus 150 end cell row blank equals cell 54 minus 150 end cell row blank equals cell negative 96 end cell end table 

Jadi, 2 a with rightwards harpoon with barb upwards on top times 3 b with rightwards harpoon with barb upwards on top equals negative 96.

Dengan demikian, hasil yang diperoleh adalah a with rightwards harpoon with barb upwards on top plus b with rightwards harpoon with barb upwards on top equals 6 i plus 2 ja with rightwards harpoon with barb upwards on top minus b with rightwards harpoon with barb upwards on top equals 2 i plus 10 k dan 2 a with rightwards harpoon with barb upwards on top times 3 b with rightwards harpoon with barb upwards on top equals negative 96.

Perdalam pemahamanmu bersama Master Teacher
di sesi Live Teaching, GRATIS!

78

Ega Nurlintang

Jawaban tidak sesuai

Iklan

Iklan

Pertanyaan serupa

Diketahui A ( 2 , 6 , − 5 ) , B ( − 1 , 3 , 7 ) , dan C ( 4 , − 1 , 8 ) . AB dan BC berturut-turut mewakili vektor u dan v . Tentukan: d. ( 2 u − 3 v ) 2

1

4.5

Jawaban terverifikasi

RUANGGURU HQ

Jl. Dr. Saharjo No.161, Manggarai Selatan, Tebet, Kota Jakarta Selatan, Daerah Khusus Ibukota Jakarta 12860

Coba GRATIS Aplikasi Roboguru

Coba GRATIS Aplikasi Ruangguru

Download di Google PlayDownload di AppstoreDownload di App Gallery

Produk Ruangguru

Hubungi Kami

Ruangguru WhatsApp

+62 815-7441-0000

Email info@ruangguru.com

[email protected]

Contact 02140008000

02140008000

Ikuti Kami

©2024 Ruangguru. All Rights Reserved PT. Ruang Raya Indonesia