Lala L

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Lala L

Ditanya 21 jam yang lalu

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1. DIKETAHUI F(X) = X + 2, G(X) = 2X - 3, DAN H(X) = 2X - 1 PER X + 3. TENTUKAN (H°G°F)^-1 (-2)! ^ itu pangkat ya 2. DIKETAHUI MATRIKS A = ( 2 -1 ) 1 4 B = ( X+Y 2) 3 Y C = ( 7 2 ) 3 1 JIKA B-A = C^T, MAKA NILAI 3X + Y ADALAH... tolong bantu jawab yaa, pake cara yang lengkap dan jelas!

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Dijawab 20 jam yang lalu

<p><br>&nbsp;</p><ul><li>f(x) = x + 2</li><li>g(x) = 2x - 3</li><li>h(x) = \dfrac{2x - 1}{x + 3}</li></ul><p><br>&nbsp;</p><p><br>&nbsp;</p><p>Ditanya:</p><p>(H \circ G \circ F)^{-1}(-2)</p><p><br>&nbsp;</p><p><br>&nbsp;</p><p><strong>Langkah 1: Cari komposisi H \circ G \circ F</strong></p><p><br>&nbsp;</p><p><br>&nbsp;</p><p>a. g(f(x))</p><p>f(x) = x+2</p><p>g(f(x)) = g(x+2) = 2(x+2) - 3 = 2x + 1</p><p><br>&nbsp;</p><p>b. h(g(f(x)))</p><p>h(2x+1) = \frac{2(2x+1)-1}{(2x+1)+3}</p><p>= \frac{4x+2-1}{2x+4} = \frac{4x+1}{2x+4}</p><p><br>&nbsp;</p><p>Jadi:</p><p>(H \circ G \circ F)(x) = \frac{4x+1}{2x+4}</p><p><br>&nbsp;</p><p><br>&nbsp;</p><p><br>&nbsp;</p><p><br>&nbsp;</p><p><strong>Langkah 2: Cari inversenya</strong></p><p><br>&nbsp;</p><p><br>&nbsp;</p><p>Misalkan:</p><p>y = \frac{4x+1}{2x+4}</p><p><br>&nbsp;</p><p>Kalikan silang:</p><p>y(2x+4) = 4x+1</p><p>2yx + 4y = 4x + 1</p><p><br>&nbsp;</p><p>Pindahkan:</p><p>2yx - 4x = 1 - 4y</p><p>x(2y - 4) = 1 - 4y</p><p><br>&nbsp;</p><p>x = \frac{1 - 4y}{2y - 4}</p><p><br>&nbsp;</p><p>Maka:</p><p>(H \circ G \circ F)^{-1}(y) = \frac{1 - 4y}{2y - 4}</p><p><br>&nbsp;</p><p><br>&nbsp;</p><p><br>&nbsp;</p><p><br>&nbsp;</p><p><strong>Langkah 3: Substitusi y = -2</strong></p><p><br>&nbsp;</p><p><br>&nbsp;</p><p>(H \circ G \circ F)^{-1}(-2) = \frac{1 - 4(-2)}{2(-2) - 4} = \frac{1 + 8}{-4 - 4} = \frac{9}{-8}</p><p><br>&nbsp;</p><p>✅ Jawaban nomor 1:</p><p>\boxed{-\frac{9}{8}}</p><p><br>&nbsp;</p><p><br>&nbsp;</p><p><br>&nbsp;</p><p><br>&nbsp;</p><p><strong>2. Diketahui matriks</strong></p><p><br>&nbsp;</p><p><br>&nbsp;</p><p>A = \begin{pmatrix} 2 &amp; -1 \\ 1 &amp; 4 \end{pmatrix} \quad B = \begin{pmatrix} x+y &amp; 2 \\ 3 &amp; y \end{pmatrix} \quad C = \begin{pmatrix} 7 &amp; 2 \\ 3 &amp; 1 \end{pmatrix}</p><p><br>&nbsp;</p><p>Diketahui:</p><p>B - A = C^T</p><p><br>&nbsp;</p><p><br>&nbsp;</p><p><br>&nbsp;</p><p><br>&nbsp;</p><p><strong>Langkah 1: Cari C^T</strong></p><p><br>&nbsp;</p><p><br>&nbsp;</p><p>C^T = \begin{pmatrix} 7 &amp; 3 \\ 2 &amp; 1 \end{pmatrix}</p><p><br>&nbsp;</p><p><br>&nbsp;</p><p><br>&nbsp;</p><p><br>&nbsp;</p><p><strong>Langkah 2: Hitung B - A</strong></p><p><br>&nbsp;</p><p><br>&nbsp;</p><p>B - A = \begin{pmatrix} (x+y)-2 &amp; 2-(-1) \\ 3-1 &amp; y-4 \end{pmatrix} = \begin{pmatrix} x+y-2 &amp; 3 \\ 2 &amp; y-4 \end{pmatrix}</p><p><br>&nbsp;</p><p><br>&nbsp;</p><p><br>&nbsp;</p><p><br>&nbsp;</p><p><strong>Langkah 3: Samakan elemen matriks</strong></p><p><br>&nbsp;</p><p><br>&nbsp;</p><p>\</p><p><br>&nbsp;</p><p>Diperoleh:</p><p><br>&nbsp;</p><ol><li>x+y-2 = 7 \Rightarrow x+y = 9</li><li>y-4 = 1 \Rightarrow y = 5</li></ol><p><br>&nbsp;</p><p><br>&nbsp;</p><p>Maka:</p><p>x = 9 - 5 = 4</p><p><br>&nbsp;</p><p><br>&nbsp;</p><p><br>&nbsp;</p><p><br>&nbsp;</p><p><strong>Langkah 4: Hitung 3x + y</strong><br>&nbsp;</p><p>3x + y = 3(4) + 5 = 12 + 5 = 17<br>&nbsp;</p><p>✅ Jawaban nomor 2:</p><p>&nbsp;</p><p><br>&nbsp;</p>


 

  • f(x) = x + 2
  • g(x) = 2x - 3
  • h(x) = \dfrac{2x - 1}{x + 3}


 


 

Ditanya:

(H \circ G \circ F)^{-1}(-2)


 


 

Langkah 1: Cari komposisi H \circ G \circ F


 


 

a. g(f(x))

f(x) = x+2

g(f(x)) = g(x+2) = 2(x+2) - 3 = 2x + 1


 

b. h(g(f(x)))

h(2x+1) = \frac{2(2x+1)-1}{(2x+1)+3}

= \frac{4x+2-1}{2x+4} = \frac{4x+1}{2x+4}


 

Jadi:

(H \circ G \circ F)(x) = \frac{4x+1}{2x+4}


 


 


 


 

Langkah 2: Cari inversenya


 


 

Misalkan:

y = \frac{4x+1}{2x+4}


 

Kalikan silang:

y(2x+4) = 4x+1

2yx + 4y = 4x + 1


 

Pindahkan:

2yx - 4x = 1 - 4y

x(2y - 4) = 1 - 4y


 

x = \frac{1 - 4y}{2y - 4}


 

Maka:

(H \circ G \circ F)^{-1}(y) = \frac{1 - 4y}{2y - 4}


 


 


 


 

Langkah 3: Substitusi y = -2


 


 

(H \circ G \circ F)^{-1}(-2) = \frac{1 - 4(-2)}{2(-2) - 4} = \frac{1 + 8}{-4 - 4} = \frac{9}{-8}


 

✅ Jawaban nomor 1:

\boxed{-\frac{9}{8}}


 


 


 


 

2. Diketahui matriks


 


 

A = \begin{pmatrix} 2 & -1 \\ 1 & 4 \end{pmatrix} \quad B = \begin{pmatrix} x+y & 2 \\ 3 & y \end{pmatrix} \quad C = \begin{pmatrix} 7 & 2 \\ 3 & 1 \end{pmatrix}


 

Diketahui:

B - A = C^T


 


 


 


 

Langkah 1: Cari C^T


 


 

C^T = \begin{pmatrix} 7 & 3 \\ 2 & 1 \end{pmatrix}


 


 


 


 

Langkah 2: Hitung B - A


 


 

B - A = \begin{pmatrix} (x+y)-2 & 2-(-1) \\ 3-1 & y-4 \end{pmatrix} = \begin{pmatrix} x+y-2 & 3 \\ 2 & y-4 \end{pmatrix}


 


 


 


 

Langkah 3: Samakan elemen matriks


 


 

\


 

Diperoleh:


 

  1. x+y-2 = 7 \Rightarrow x+y = 9
  2. y-4 = 1 \Rightarrow y = 5


 


 

Maka:

x = 9 - 5 = 4


 


 


 


 

Langkah 4: Hitung 3x + y
 

3x + y = 3(4) + 5 = 12 + 5 = 17
 

✅ Jawaban nomor 2:

 


 


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