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Berikut ini adalah pertanyaan dari DWB5XJO pada mata pelajaran Matematika untuk jenjang Sekolah Menengah Atas

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Soal tertera di gambar ​

Jawaban dan Penjelasan

Berikut ini adalah pilihan jawaban terbaik dari pertanyaan diatas.

Nomor 1

a.

(fog)(x) = f(g(x))

(fog)(x) = 2(3x + 4) - 1

(fog)(x) = 6x + 8 - 1

(fog)(x) = 6x + 7

b.

(gof)(x) = g(f(x))

(gof)(x) = 3(2x - 1) + 4

(gof)(x) = 6x - 3 + 4

(gof)(x) = 6x + 1

Nomor 2

(fog)(x) = f(g(x))

(fog)(x) =(x + 4) {}^{2} - 1

(fog)( - 1) =( - 1 + 4) {}^{2} - 1

(fog)( - 1) =(3) {}^{2} - 1

(fog)( - 1) =9 - 1

(fog)( - 1) =8

Nomor 3

a.

(fogoh)(x) = f(g(h(x)))

(fogoh)(x) = f(g( {x}^{2} + 2x + 4))

(fogoh)(x) =f(( {x}^{2} + 2x + 4) - 4)

(fogoh)(x) =f( {x}^{2} + 2x)

(fogoh)(x) =2( {x}^{2} + 2x) + 1

(fogoh)(x) =2 {x}^{2} + 4x + 1

b.

(gohof)(x) = g(h(f(x)))

(gohof)(x) = g(h(2x + 1))

(gohof)(x) = g((2x + 1) {}^{2} + 2(2x + 1) + 4)

(gohof)(x) = g((4 {x}^{2} + 4x + 1) + 4x + 2 + 4)

(gohof)(x) = g(4 {x}^{2} + 8x + 7)

(gohof)(x) = (4 {x}^{2} + 8x + 7) - 4

(gohof)(x) = 4 {x}^{2} + 8x + 3

Nomor 4

(fohog)(x) = f(h(g(x)))

(fohog)(x) = f(h(2 {x}^{2} + 3x - 4 ))

(fohog)(x) =f((2 {x}^{2} + 3x - 4) + 2)

(fohog)(x) =f(2 {x}^{2} + 3x - 2)

(fohog)(x) =3(2 {x}^{2} + 3x - 2) - 1

(fohog)(1) =3(2 {(1)}^{2} + 3(1) - 2) - 1

(fohog)(1) =3(2 + 3 - 2) - 1)

(fohog)(1) =3(3) - 1

(fohog)(1) =9 - 1

(fohog)(1) =8

Nomor 5

(fog)(x) = {x}^{2} + 2x - 4

f(g(x)) = {x}^{2} + 2x - 4

g(x) + 2 = {x}^{2} + 2x - 4

g(x) = {x}^{2} + 2x - 4 - 2

g(x) = {x }^{2} + 2x - 6

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Last Update: Sat, 06 May 23