بِسْـــــــمِ اللّٰهِ الرَّحْمٰنِ الرَّحِيْمِ
..
2. Nilai maksimum = A. 46
3. U₁₅ = B. 110
4. [tex]\bold{B. ~\frac{6}{5}}[/tex]
5. f'(x) = 12x² - 8x - 24
Perhatikan grafik fungsi objektif (lihat gambar). Dari grafik fungsi objektif tersebut, kita mendapat titik-titik:
Titik A = (0, 0)
Titik B = (5, 0)
Titik C = perpotongan garis 1 dan garis 2.
bx + ay = ab
5x + 5y = 5 × 5
5x + 5y = 25 (÷5)
x + y = 5 ...... (pers 1)
2x - 1y = -1 × 2
2x - y = -2 ....... (pers 2)
[tex]\begin{array}{lll} \:\:\:\:\: x + y = 5\\ \: \: \: 2x - y= - 2\\\begin{array}{l}\rule{2cm}{0.2pt} \: \: + \end{array} \\ \:\:\:\:\:\:\:\:\:\:\: 3x = 3 \\\:\:\:\:\:\:\:\:\:\:\:\:\:x =\frac{3}{3} \\\:\:\:\:\:\:\:\:\:\:\:\:\:x =1 \end{array}[/tex]
[tex]\begin{aligned}x + y &= 5 \\ 1 + y &= 5 \\y &= 5 - 1 \\ y&= 4\end{aligned}[/tex]
Maka, titik C = (1, 4)
Titik D = (0, 3)
.
Nilai fungsi objektif f(x, y) = 6x + 10y pada titik A, B, C, D:
Nilai maksimum/terbesar = 46
[tex] \\ [/tex]
[tex]\begin{array}{lll}U₄ &=a+3b=33\\U₇ &=a+6b=54\\&\begin{array}{l}\rule{2cm}{0.2pt}~~\rule{0.2cm}{0.2pt}\end{array}\\& \: \: \: \: \: \: -3b~~~=-21\\& \: \: \: \: \: \: \: b~~~~~~~=\dfrac{-21}{-3}\\& \: \: \: \: \: \: \: b~~~~~~~=7\end{array}[/tex]
[tex]\begin{aligned}a + 3b &= 33 \\ a + 3(7) &= 33 \\ a + 21 &= 33 \\ a &= 33-21 \\ a&= 12\end{aligned}[/tex]
U₁₅ = a + 14b
U₁₅ = 12 + 14(7)
U₁₅ = 12 + 98
U₁₅ = 110
[tex]\displaystyle\lim_{x \to 3} \: \frac{ {x}^{2} - 9 }{ {2x}^{2} - 7x + 3} [/tex]
[tex]\displaystyle\lim_{x \to 3} \: \frac{(x + 3) \cancel{(x - 3)}}{(2x - 1) \cancel{(x - 3)}} [/tex]
[tex]\displaystyle\lim_{x \to 3} \frac{x + 3}{2x - 1} [/tex]
[tex] \displaystyle \: \: \: \: \: = \frac{3 + 3}{2(3) - 1} [/tex]
[tex] \displaystyle \: \: \: \: \: = \frac{6}{6 - 1} [/tex]
[tex]\displaystyle \: \: \: \: \: = \frac{6}{5} [/tex]
f(x) = (4x² - 12x)(x + 2)
Rumus:
[tex]\red{\boxed{\bold{\orange{f(x)=u.v} \red{ \: \to \: } \orange{f'(x) = u'.v + v'. u}}}}[/tex]
f'(x) = u'.v + v'.u
f'(x) = (8x - 12)(x + 2) + 1(4x² - 12x)
f'(x) = 8x² + 16x - 12x - 24 + 4x² - 12x
f'(x) = 8x² + 4x² + 16x - 12x - 12x - 24
f'(x) = 12x² - 8x - 24
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بِسْـــــــمِ اللّٰهِ الرَّحْمٰنِ الرَّحِيْمِ
..
2. Nilai maksimum = A. 46
3. U₁₅ = B. 110
4. [tex]\bold{B. ~\frac{6}{5}}[/tex]
5. f'(x) = 12x² - 8x - 24
Pembahasan
Nomor 2
Perhatikan grafik fungsi objektif (lihat gambar). Dari grafik fungsi objektif tersebut, kita mendapat titik-titik:
Titik A = (0, 0)
Titik B = (5, 0)
Titik C = perpotongan garis 1 dan garis 2.
bx + ay = ab
5x + 5y = 5 × 5
5x + 5y = 25 (÷5)
x + y = 5 ...... (pers 1)
2x - 1y = -1 × 2
2x - y = -2 ....... (pers 2)
[tex]\begin{array}{lll} \:\:\:\:\: x + y = 5\\ \: \: \: 2x - y= - 2\\\begin{array}{l}\rule{2cm}{0.2pt} \: \: + \end{array} \\ \:\:\:\:\:\:\:\:\:\:\: 3x = 3 \\\:\:\:\:\:\:\:\:\:\:\:\:\:x =\frac{3}{3} \\\:\:\:\:\:\:\:\:\:\:\:\:\:x =1 \end{array}[/tex]
[tex]\begin{aligned}x + y &= 5 \\ 1 + y &= 5 \\y &= 5 - 1 \\ y&= 4\end{aligned}[/tex]
Maka, titik C = (1, 4)
Titik D = (0, 3)
.
Nilai fungsi objektif f(x, y) = 6x + 10y pada titik A, B, C, D:
Nilai maksimum/terbesar = 46
[tex] \\ [/tex]
Nomor 3
[tex]\begin{array}{lll}U₄ &=a+3b=33\\U₇ &=a+6b=54\\&\begin{array}{l}\rule{2cm}{0.2pt}~~\rule{0.2cm}{0.2pt}\end{array}\\& \: \: \: \: \: \: -3b~~~=-21\\& \: \: \: \: \: \: \: b~~~~~~~=\dfrac{-21}{-3}\\& \: \: \: \: \: \: \: b~~~~~~~=7\end{array}[/tex]
[tex]\begin{aligned}a + 3b &= 33 \\ a + 3(7) &= 33 \\ a + 21 &= 33 \\ a &= 33-21 \\ a&= 12\end{aligned}[/tex]
U₁₅ = a + 14b
U₁₅ = 12 + 14(7)
U₁₅ = 12 + 98
U₁₅ = 110
[tex] \\ [/tex]
Nomor 4
[tex]\displaystyle\lim_{x \to 3} \: \frac{ {x}^{2} - 9 }{ {2x}^{2} - 7x + 3} [/tex]
[tex]\displaystyle\lim_{x \to 3} \: \frac{(x + 3) \cancel{(x - 3)}}{(2x - 1) \cancel{(x - 3)}} [/tex]
[tex]\displaystyle\lim_{x \to 3} \frac{x + 3}{2x - 1} [/tex]
[tex] \displaystyle \: \: \: \: \: = \frac{3 + 3}{2(3) - 1} [/tex]
[tex] \displaystyle \: \: \: \: \: = \frac{6}{6 - 1} [/tex]
[tex]\displaystyle \: \: \: \: \: = \frac{6}{5} [/tex]
[tex] \\ [/tex]
Nomor 5
f(x) = (4x² - 12x)(x + 2)
Rumus:
[tex]\red{\boxed{\bold{\orange{f(x)=u.v} \red{ \: \to \: } \orange{f'(x) = u'.v + v'. u}}}}[/tex]
f'(x) = u'.v + v'.u
f'(x) = (8x - 12)(x + 2) + 1(4x² - 12x)
f'(x) = 8x² + 16x - 12x - 24 + 4x² - 12x
f'(x) = 8x² + 4x² + 16x - 12x - 12x - 24
f'(x) = 12x² - 8x - 24
..
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