Iklan

Pertanyaan

Tentukan rumus fungsi ( f + g ) ( x ) , ( f ⋅ g ) ( x ) , ( g f ​ ) ( x ) dan daerah asalnya, jika diketahui f ( x ) dan g ( x ) berikut: f ( x ) = x 2 − x − 8 ​ dan g ( x ) = x + 8 ​ 1 ​

Tentukan rumus fungsi  dan daerah asalnya, jika diketahui  dan  berikut:

   

Ikuti Tryout SNBT & Menangkan E-Wallet 100rb

Habis dalam

01

:

04

:

41

:

08

Klaim

Iklan

M. Mariyam

Master Teacher

Mahasiswa/Alumni Institut Pertanian Bogor

Jawaban terverifikasi

Pembahasan

Sebelum menjawab soal di atas, kita asumsikan bahwa , supaya persamaan di dalam akar dapat difaktorkan. sehingga jika , maka a. Daerah asal adalah b. Daerah asal adalah c. Daerah asal adalah

Sebelum menjawab soal di atas, kita asumsikan bahwa begin mathsize 14px style f open parentheses x close parentheses equals square root of x squared minus 2 x minus 8 end root end style , supaya persamaan di dalam akar dapat difaktorkan. sehingga 

jika begin mathsize 14px style f left parenthesis x right parenthesis equals square root of x squared minus 2 x minus 8 end root space dan space g left parenthesis x right parenthesis equals fraction numerator 1 over denominator square root of x plus 8 end root end fraction end style, maka

a. begin mathsize 14px style open parentheses f plus g close parentheses left parenthesis x right parenthesis end style 

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell left parenthesis f plus g right parenthesis left parenthesis x right parenthesis end cell equals cell f left parenthesis x right parenthesis plus g left parenthesis x right parenthesis end cell row blank equals cell square root of x squared minus 2 x minus 8 end root plus fraction numerator 1 over denominator square root of x plus 8 end root end fraction end cell end table end style  

Daerah asal begin mathsize 14px style open parentheses f plus g close parentheses left parenthesis x right parenthesis end style adalah

undefined 

b. begin mathsize 14px style left parenthesis f times g right parenthesis end style size 14px left parenthesis size 14px x size 14px right parenthesis 

table attributes columnalign right center left columnspacing 0px end attributes row cell size 14px left parenthesis size 14px f size 14px times size 14px g size 14px right parenthesis size 14px left parenthesis size 14px x size 14px right parenthesis end cell size 14px equals cell size 14px f size 14px left parenthesis size 14px x size 14px right parenthesis size 14px times size 14px g size 14px left parenthesis size 14px x size 14px right parenthesis end cell row blank size 14px equals cell square root of size 14px x to the power of size 14px 2 size 14px minus size 14px 2 size 14px x size 14px minus size 14px 8 end root size 14px. fraction numerator size 14px 1 over denominator square root of size 14px x size 14px plus size 14px 8 end root end fraction end cell row blank size 14px equals cell square root of fraction numerator size 14px x to the power of size 14px 2 size 14px minus size 14px 2 size 14px x size 14px minus size 14px 8 over denominator size 14px x size 14px plus size 14px 8 end fraction end root end cell end table    

Daerah asal begin mathsize 14px style left parenthesis f times g right parenthesis end style size 14px left parenthesis size 14px x size 14px right parenthesis  adalah

 

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell D subscript f end cell equals cell left curly bracket right enclose x x squared minus 2 x minus 8 greater or equal than 0 comma space x element of straight real numbers right curly bracket end cell row blank equals cell left curly bracket right enclose x open parentheses x minus 4 close parentheses open parentheses x plus 2 close parentheses greater or equal than 0 comma space x element of straight real numbers right curly bracket end cell row blank equals cell left curly bracket right enclose x x less or equal than negative 2 space atau space x greater or equal than 4 comma space x element of straight real numbers right curly bracket end cell row cell D subscript g end cell equals cell left curly bracket right enclose x x plus 8 greater than 0 comma space x element of straight real numbers right curly bracket end cell row blank equals cell left curly bracket right enclose x x greater than negative 8 comma space x element of straight real numbers right curly bracket end cell row cell D subscript f times g end subscript end cell equals cell D subscript f intersection D subscript g end cell row blank equals cell left curly bracket right enclose x x less or equal than negative 2 space atau space x greater or equal than 4 comma space x element of straight real numbers right curly bracket intersection left curly bracket right enclose x x greater than negative 8 comma space x element of straight real numbers right curly bracket end cell row blank equals cell left curly bracket right enclose x minus 8 less than x less or equal than negative 2 space atau space x greater or equal than 4 comma space x element of straight real numbers right curly bracket end cell row blank blank blank end table end style 

 c. begin mathsize 14px style open parentheses f over g close parentheses open parentheses x close parentheses end style  

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell open parentheses f over g close parentheses open parentheses x close parentheses end cell equals cell fraction numerator f left parenthesis x right parenthesis over denominator g left parenthesis x right parenthesis end fraction end cell row blank equals cell square root of x squared minus 2 x minus 8 end root divided by fraction numerator 1 over denominator square root of x plus 8 end root end fraction end cell row blank equals cell square root of x squared minus 2 x minus 8 end root times square root of x plus 8 end root end cell row blank equals cell square root of x cubed plus 6 x squared minus 24 x minus 64 end root end cell end table end style     

Daerah asal begin mathsize 14px style open parentheses f over g close parentheses open parentheses x close parentheses end style  adalah

 

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell D subscript f end cell equals cell left curly bracket right enclose x x squared minus 2 x minus 8 greater or equal than 0 comma space x element of straight real numbers right curly bracket end cell row blank equals cell left curly bracket right enclose x left parenthesis x minus 4 right parenthesis left parenthesis x plus 2 right parenthesis greater or equal than 0 comma space x element of straight real numbers right curly bracket end cell row blank equals cell left curly bracket right enclose x x less or equal than negative 2 space atau space x greater or equal than 4 comma space x element of straight real numbers right curly bracket end cell row cell D subscript g end cell equals cell left curly bracket right enclose x x plus 8 greater than 0 comma space x element of straight real numbers right curly bracket end cell row blank equals cell left curly bracket right enclose x x greater than negative 8 comma space x element of straight real numbers right curly bracket end cell row cell D subscript f over g end subscript end cell equals cell D subscript f intersection D subscript g comma space g not equal to 0 end cell row blank equals cell left curly bracket right enclose x x less or equal than negative 2 space atau space x greater or equal than 4 comma space x element of straight real numbers right curly bracket intersection left curly bracket right enclose x x greater than negative 8 comma space x element of straight real numbers right curly bracket comma space x not equal to negative 8 end cell row blank equals cell left curly bracket right enclose x minus 8 less than x less or equal than negative 2 space atau space x greater or equal than 4 comma space x element of straight real numbers right curly bracket end cell row blank blank blank end table end style 

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

5

Sella Sinaga

Pembahasan tidak menjawab soal

Amanda Dibya aji purwati

Jawaban tidak sesuai

Iklan

Pertanyaan serupa

Tentukan rumus fungsi ( f + g ) ( x ) , ( f ⋅ g ) ( x ) , ( g f ​ ) ( x ) dan daerah asalnya, jika diketahui f ( x ) dan g ( x ) berikut: f ( x ) = x 2 − 16 ​ dan g ( x ) = 2 x + 6 ​ 1 ​

68

5.0

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