Iklan

Pertanyaan

Diketahui a = ⎝ ⎛ ​ 2 0 − 2 ​ ⎠ ⎞ ​ dan b = ⎝ ⎛ ​ 4 0 − 4 ​ ⎠ ⎞ ​ membentuk sudut 6 0 ∘ . Hitunglah nilai a ⋅ b !

Diketahui  dan  membentuk sudut . Hitunglah nilai 

Ikuti Tryout SNBT & Menangkan E-Wallet 100rb

Habis dalam

02

:

22

:

46

:

56

Klaim

Iklan

D. Rajib

Master Teacher

Mahasiswa/Alumni Universitas Muhammadiyah Malang

Jawaban terverifikasi

Jawaban

nilai adalah .

 nilai begin mathsize 14px style straight a with rightwards arrow on top times straight b with rightwards arrow on top end style adalah begin mathsize 14px style 8 end style.

Pembahasan

Ingat kembali: Diketahui: Maka: Dengan demikian,nilai adalah .

Ingat kembali:

begin mathsize 14px style cos space straight theta equals fraction numerator straight a with rightwards arrow on top times space straight b with rightwards arrow on top over denominator open vertical bar straight a with rightwards arrow on top close vertical bar times space open vertical bar straight b with rightwards arrow on top close vertical bar end fraction space straight a with rightwards arrow on top times space straight b with rightwards arrow on top equals open vertical bar straight a with rightwards arrow on top close vertical bar times space open vertical bar straight b with rightwards arrow on top close vertical bar times space cos space straight theta end style 

Diketahui:

begin mathsize 14px style straight a with rightwards arrow on top equals open parentheses table row 2 row 0 row cell negative 2 end cell end table close parentheses comma space straight b with rightwards arrow on top equals open parentheses table row 4 row 0 row cell negative 4 end cell end table close parentheses comma space straight theta equals 60 degree end style 

Maka:

begin mathsize 14px style straight a with rightwards harpoon with barb upwards on top times space straight b with rightwards arrow on top equals open vertical bar straight a with rightwards arrow on top close vertical bar times space open vertical bar straight b with rightwards arrow on top close vertical bar times space cos space straight theta straight a with rightwards harpoon with barb upwards on top times space straight b with rightwards arrow on top equals square root of 2 squared plus 0 squared plus open parentheses negative 2 close parentheses squared end root times space square root of 4 squared plus 0 squared plus open parentheses negative 4 close parentheses squared end root times space cos space 60 degree straight a with rightwards harpoon with barb upwards on top times space straight b with rightwards arrow on top equals square root of 4 plus 0 plus 4 end root times space square root of 16 plus 0 plus 16 end root times space 1 half straight a with rightwards harpoon with barb upwards on top times space straight b with rightwards arrow on top equals square root of 8 times space square root of 32 times space 1 half straight a with rightwards harpoon with barb upwards on top times space straight b with rightwards arrow on top equals square root of 256 times space space 1 half straight a with rightwards harpoon with barb upwards on top times space straight b with rightwards arrow on top equals 16 times space 1 half straight a with rightwards harpoon with barb upwards on top times space straight b with rightwards arrow on top equals 8 end style 

Dengan demikian, nilai begin mathsize 14px style straight a with rightwards arrow on top times straight b with rightwards arrow on top end style adalah begin mathsize 14px style 8 end style.

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

1

Iklan

Pertanyaan serupa

Diketahui . Besar sudut antara a d an b adalah ....

4

3.5

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