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1. Diketahui matriks A = (
4 −1
−2 7
), B = (
−4 1
2 7
), dan C = (
−8 𝑎
𝑏 −14
). Nilai a dan b yang
memenuhi A + 3B = C berturut-turut adalah...
A. 2 dan 4
B. -2 dan 4
C. – 8 dan -14
D. 8 dan -14
E. 8 dan 14
CARA :
Jika matriks A = (
𝑎 𝑏
𝑐 𝑑
) , B = (
𝑒 𝑓
𝑔 ℎ
) , C =(
𝑖 𝑘
𝑗 𝑙
) maka:
3B = (
3. 𝑒 3. 𝑓
3. 𝑔 3. ℎ
)
A + 3B = C adalah
(
𝑎 𝑏
𝑐 𝑑
) + (
3. 𝑒 3. 𝑓
3. 𝑔 3. ℎ
) = (
𝑖 𝑘
𝑗 𝑙
)
(
𝑎 + (3.𝑒) 𝑏 + (3.𝑓)
𝑐 + (3. 𝑔) 𝑑 + (3. ℎ)
) = (
𝑖 𝑘
𝑗 𝑙
)
2. Transpos dari matriks M =
A. C. E.
B. D.
CARA :
Jika matriks A = (
𝑎 𝑏
𝑐 𝑑
) maka Transpose dari matriks A = (
𝑎 𝑐
𝑏 𝑑
)
3. Jika Y = dan Z = maka Y + Z =…..
A. (
1 4
4 7
)
B. (
1 0
−2 1
)
C. (
1 0
−2 4
)
D. (
1 0
−2 7
)
E. (
1 4
−2 7
)
4. Jika B= dan C = maka BxC = …..
A. C. E.
B. D.
CARA :
Jika matriks A = (
𝑎 𝑏
𝑐 𝑑
) , B = (
𝑒 𝑓
𝑔 ℎ
) maka A x B adalah (
𝑎. 𝑒 + 𝑏. 𝑔 𝑎. 𝑓 + 𝑏. ℎ
𝑐. 𝑒 + 𝑑. 𝑔 𝑐. 𝑓 + 𝑑. ℎ
)
5. Jika R= maka determinan matriks R adalah….
A. 26
B. 6
C. -16
D. -26
E. -6
CARA :
Jika matriks A = (
𝑎 𝑏
𝑐 𝑑
) maka determinan matriks A = a.d – b.c
6. Invers dari matriks Q = adalah….
A. C. E.
B. D.
CARA :
Jika matriks A = (
𝑎 𝑏
𝑐 𝑑
) maka invers dari matriks A =
1
𝑑𝑒𝑡𝑒𝑟𝑚𝑖𝑛𝑎𝑛 𝐴
𝑥 𝑎𝑑𝑗𝑜𝑖𝑛 𝐴
Adjoin A = (
𝑑 −𝑏
−𝑐 𝑎
)
7. Nilai x dan y yang memenuhi persamaan + 3 = adalah…..
A. X = 2 dan y = -3
B. x = 3 dan y = 3
C. x = 2 dan y = -4
D. X =3 dan y = -4
E. x = -3 dan y =4
8. Diketahui vektor 𝑎
̅ = (
−1
2
) dan 𝑏
̅ = (
3
−5
), vektor 𝑎
̅ + 𝑏
̅ = .....
A. (
2
−3
)
B. (
−3
2
)
C. (
−4
3
)
D. (
1
−3
)
E. (
−2
3
)
CARA :
Jika vektor 𝑎
̅ = (
𝑥1
𝑦1
) dan 𝑏
̅ = (
𝑥2
𝑦2
), vektor 𝑎
̅ + 𝑏
̅ =(
𝑥1 + 𝑥2
𝑦1 + 𝑦2
)
9. Jika vektor 𝑎
̅ = (
1
2
3
), 𝑏
̅ = (
5
4
−1
), dan 𝑐̅ = (
4
−1
1
), maka vektor 𝑎
̅ + 2𝑏
̅ - 3𝑐̅ adalah..
A. (
6
11
−8
)
B. (
7
13
−8
)
C. (
−1
12
−2
)
D. (
−1
13
−2
)
E. (
−6
−12
8
)
CARA :
Jika 𝑏
̅ = (
𝑥
𝑦
𝑧
) maka 2𝑏
̅ = (
2. 𝑥
2. 𝑦
2. 𝑧
)
10. Diketahui vektor 𝑎
̅ = (
−1
2
), panjang vektor 𝑎
̅ adalah ....
A. 5
B. √3
C. √5
D. 1
E. 3
CARA :
Jika vektor 𝑎
̅ = (
𝑥
𝑦) maka panjang vektor 𝑎
̅ = √𝑥2 + 𝑦2
11. Diketahui vektor 𝑎
̅ = (
1
−2
3
) dan 𝑏
̅ = (
−2
3
0
), vektor 𝑎
̅ • 𝑏
̅ = .....
A. – 8
B. -1
C. 8
D. 4
E. 5
CARA :
Jika vektor 𝑎
̅ = (
𝑥1
𝑦1
𝑧1
), 𝑏
̅ = (
𝑥2
𝑦2
𝑧2
) maka vektor 𝑎
̅ • 𝑏
̅ = x1.x2 + y1.y2 + z1.z2
12. Diketahui vektor 𝑎
̅ = 3𝑖̅ - 2𝑗̅ + 𝑘
̅ dan 𝑏
̅ = 2𝑖̅ + 𝑗̅ + p𝑘
̅ , jika 𝑎
̅ • 𝑏
̅ = 6, maka nilai p = ..
A. -3
B. 2
C. 3
D. 4
E. 6
13. Jika vektor 𝑎
̅ dan vektor 𝑏
̅ membentuk sudut 60° , |𝑎
̅| = 2 dan |𝑏
̅| = 5, maka nilai dari
vektor 𝑎
̅ • 𝑏
̅ adalah...
A. 5
B. 7
C. 9
D. 10
E. 4
CARA :
vektor 𝑎
̅ • 𝑏
̅ = |𝑎
̅|. |𝑏
̅| . Cos 60°
nilai Cos 0° = 1
Cos 30° =
1
2
√3
Cos 45° =
1
2
√2
Cos 60° =
1
2
Cos 90° = 0
14. Jika 𝑎
̅ = 3𝑖̅ - 2𝑗̅ + 𝑘
̅ , 𝑏
̅ = 2𝑖̅ - 4𝑗̅ - 3𝑘
̅ dan 𝑐̅ = −𝑖̅ + 2𝑗̅ + 2𝑘
̅ maka 2𝑎
̅ - 3𝑏
̅ - 5𝑐̅ adalah...
A. 𝑖̅ - 2𝑗̅ - 5𝑘
̅
B. −5𝑖̅ - 2𝑗̅ - 5𝑘
̅
C. 2𝑖̅ - 5𝑗̅ - 𝑘
̅
D. 5𝑖̅ - 2𝑗̅ + 𝑘
̅
E. 5𝑖̅ - 2𝑗̅
CARA :
Jika 𝑎
̅ = 𝑎𝑖̅ + b𝑗̅ + c𝑘
̅ , 𝑏
̅ = 𝑑𝑖̅ + e𝑗̅ + f𝑘
̅ dan 𝑐̅ = 𝑔𝑖̅ + h𝑗̅ + i𝑘
̅
Maka 2𝑎
̅ = 2. 𝑎𝑖̅ + 2.b𝑗̅ + 2.c𝑘
̅
15. Jika 𝑎
̅ = (
3
−2
) , 𝑏
̅ = (
1
0
) dan 𝑐̅ = (
−5
4
) maka panjang 𝑑̅ = 𝑎
̅ + 𝑏
̅ − 𝑐̅ adalah...
A. √5
B. 2√13
C. √37
D. 3√13
E. -2√41
16. Diketahui 𝑎
̅ = (
1
2
0
) dan 𝑏
̅ = (
−2
1
3
), besar sudut antara vektor 𝑎
̅ dan vektor 𝑏
̅ adalah ..
A. 30°
B. 90°
C. 45°
D. 120°
E. 60°
CARA :
Cos ∝ =
𝑎
̅ • 𝑏
̅
|𝑎
̅|.|𝑏
̅|
17. Jika sebuah persamaan kuadrat x2 - 3x + 2. Maka nilai a, b dan c adalah :
A. 1, -3, 2 B. 1, 3, 2 C. 1, -3, -2 D. 1, 3, -2 E. 2, 5 dan 8
18. Jika sebuah persamaan kuadrat x2 - 6. Maka nilai a, b dan c adalah :
A. 1, -6, 1 B. 1, -6, 0 C. 1, 0, -6 D. 1, 0, 6 E. -2, 3 dan 5
19. Jika Bentuk umum dari persamaan x2 - 16 = 7(x - 4) adalah ax2 + bx + c = 0, maka nilai a,
b, c secara berturut-turut adalah :
A. 1, -7 dan 12
B. 1, 7 dan 12
C. 1, -16 dan 7
D. 1, 7 dan 20
E. -2, 6 dan 5
20. Diketahui 𝑓(𝑥) = 2𝑥 + 5 𝑑𝑎𝑛 𝑔(𝑥) =
𝑥−1
𝑥+4
, 𝑥 ≠ −4, maka (𝑓 ° 𝑔)(𝑥) = ⋯
A.
7𝑥−2
𝑥+4
,𝑥 ≠ −4
B.
2𝑥+3
𝑥+4
,𝑥 ≠ −4
C.
2𝑥+2
𝑥+4
,𝑥 ≠ −4
D.
7𝑥+18
𝑥+4
, 𝑥 ≠ −4
E.
7𝑥+22
𝑥+4
, 𝑥 ≠ −4
CARA :
(𝑓 ° 𝑔)(𝑥) = 𝑓(𝑔(𝑥))
= 𝑓(
𝑥−1
𝑥+4
) = 2(
𝑥−1
𝑥+4
)+ 5 =
2𝑥−2
𝑥+4
+ 5 =
2𝑥−2+5(𝑥+4)
𝑥+4
=
2𝑥−2+5𝑥+20
𝑥+4
=
7𝑥+18
𝑥+4
21. Diketahui fungsi f dengan rumus f(x) = 2x – 3 dan f-1 adalah fungsi invers dari f. Nilai dari
f-1(-1) = ...
A. -12
B. -1
C. 1
D. 2
E. 3
CARA :
f(x) = 2x – 3
y = 2x – 3
y + 3 = 2x
x =
𝑦+3
2
f-1(x) =
𝑥+3
2
f-1(-1) =
−1+3
2
=
2
2
= 1
22. Diketahui fungsi 𝑓: 𝑅 → 𝑅 𝑑𝑒𝑛𝑔𝑎𝑛 𝑓(𝑥) =
3𝑥+1
2𝑥−2
untuk 𝑥 ≠ 1. Invers fungsi f adalah...
A.
2𝑥+1
2𝑥+3
B.
2𝑥−3
2𝑥+1
C.
3𝑥−2
2𝑥+1
D.
2−3𝑥
2𝑥−1
E.
2𝑥+1
2𝑥−3
CARA :
Invers 𝑓(𝑥) =
𝑎𝑥+𝑏
𝑐𝑥+𝑑
adalah 𝑓−1(𝑥) =
−𝑑𝑥+𝑏
𝑐𝑥−𝑎
23. Diketahui fungsi f dan g yang ditentukan oleh 𝑓(𝑥) = 3𝑥2
+ 𝑥 − 7 dengan 𝑔(𝑥) = 2𝑥 + 1.
Maka (𝑓°𝑔)(𝑥) = ⋯
A. 3𝑥2
+ 3𝑥 − 6
B. 6𝑥2
+ 2𝑥 − 13
C. 12𝑥2
+ 6𝑥 − 5
D. 12𝑥2
+ 14𝑥 − 3
E. 12𝑥2
+ 2𝑥 − 3
24. Fungsi 𝑓: 𝑅 → 𝑅 𝑑𝑎𝑛 𝑔: 𝑅 → 𝑅 ditentukan oleh 𝑓(𝑥) = 2𝑥 + 3 dan 𝑔(𝑥) = 𝑥2
+ 𝑥 − 2.
Nilai (𝑔 ° 𝑓)(−4) = ⋯
A. -20
B. -16
C. 0
D. 18
E. 23
25. Diketahui 𝑓(𝑥) = 3𝑥 + 2 𝑑𝑎𝑛 𝑔(𝑥) = 8x− 2 fungsi (f – g)(x) = ...
A. -5x + 1
B. -5x + 4
C. -3x + 4
D. -3x + 3
E. -3x + 1
Isilah Soal-soal Berikut Dengan Tepat dan Benar!!
26. Jika diketahui matriks A = (
2 −1 3
−4 2 0
) dan matriks B = (
1 −1
3 −2
−1 2
), maka matriks A.B
adalah...
27. Diketahui titik A = (3, 1, -4) dan B = (3, -4, 6) . Tentukan besar vektor 𝐴𝐵
̅̅̅̅ adalah...
28. Vektor-vektor 𝑎
̅ = (
−3
1
−2
) dan 𝑏
̅ = (
−2
4
𝑥
) adalah saling tegak lurus. Nilai x adalah...
29. Nilai fungsi invers 𝑓−1(2) 𝑑𝑎𝑟𝑖 𝑓(𝑥) =
3𝑥+4
2𝑥−1
, 𝑥 ≠
1
2
adalah..
Diketahui f(x) = 2x2 – 2 dan g(x) =
1
2
𝑥 + 2, maka (𝑓°𝑔)(𝑥) adalah...

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  • 1. 1. Diketahui matriks A = ( 4 −1 −2 7 ), B = ( −4 1 2 7 ), dan C = ( −8 𝑎 𝑏 −14 ). Nilai a dan b yang memenuhi A + 3B = C berturut-turut adalah... A. 2 dan 4 B. -2 dan 4 C. – 8 dan -14 D. 8 dan -14 E. 8 dan 14 CARA : Jika matriks A = ( 𝑎 𝑏 𝑐 𝑑 ) , B = ( 𝑒 𝑓 𝑔 ℎ ) , C =( 𝑖 𝑘 𝑗 𝑙 ) maka: 3B = ( 3. 𝑒 3. 𝑓 3. 𝑔 3. ℎ ) A + 3B = C adalah ( 𝑎 𝑏 𝑐 𝑑 ) + ( 3. 𝑒 3. 𝑓 3. 𝑔 3. ℎ ) = ( 𝑖 𝑘 𝑗 𝑙 ) ( 𝑎 + (3.𝑒) 𝑏 + (3.𝑓) 𝑐 + (3. 𝑔) 𝑑 + (3. ℎ) ) = ( 𝑖 𝑘 𝑗 𝑙 ) 2. Transpos dari matriks M = A. C. E. B. D. CARA : Jika matriks A = ( 𝑎 𝑏 𝑐 𝑑 ) maka Transpose dari matriks A = ( 𝑎 𝑐 𝑏 𝑑 ) 3. Jika Y = dan Z = maka Y + Z =….. A. ( 1 4 4 7 ) B. ( 1 0 −2 1 ) C. ( 1 0 −2 4 ) D. ( 1 0 −2 7 ) E. ( 1 4 −2 7 ) 4. Jika B= dan C = maka BxC = ….. A. C. E.
  • 2. B. D. CARA : Jika matriks A = ( 𝑎 𝑏 𝑐 𝑑 ) , B = ( 𝑒 𝑓 𝑔 ℎ ) maka A x B adalah ( 𝑎. 𝑒 + 𝑏. 𝑔 𝑎. 𝑓 + 𝑏. ℎ 𝑐. 𝑒 + 𝑑. 𝑔 𝑐. 𝑓 + 𝑑. ℎ ) 5. Jika R= maka determinan matriks R adalah…. A. 26 B. 6 C. -16 D. -26 E. -6 CARA : Jika matriks A = ( 𝑎 𝑏 𝑐 𝑑 ) maka determinan matriks A = a.d – b.c
  • 3. 6. Invers dari matriks Q = adalah…. A. C. E. B. D. CARA : Jika matriks A = ( 𝑎 𝑏 𝑐 𝑑 ) maka invers dari matriks A = 1 𝑑𝑒𝑡𝑒𝑟𝑚𝑖𝑛𝑎𝑛 𝐴 𝑥 𝑎𝑑𝑗𝑜𝑖𝑛 𝐴 Adjoin A = ( 𝑑 −𝑏 −𝑐 𝑎 ) 7. Nilai x dan y yang memenuhi persamaan + 3 = adalah….. A. X = 2 dan y = -3 B. x = 3 dan y = 3 C. x = 2 dan y = -4 D. X =3 dan y = -4 E. x = -3 dan y =4 8. Diketahui vektor 𝑎 ̅ = ( −1 2 ) dan 𝑏 ̅ = ( 3 −5 ), vektor 𝑎 ̅ + 𝑏 ̅ = ..... A. ( 2 −3 ) B. ( −3 2 ) C. ( −4 3 ) D. ( 1 −3 ) E. ( −2 3 ) CARA : Jika vektor 𝑎 ̅ = ( 𝑥1 𝑦1 ) dan 𝑏 ̅ = ( 𝑥2 𝑦2 ), vektor 𝑎 ̅ + 𝑏 ̅ =( 𝑥1 + 𝑥2 𝑦1 + 𝑦2 ) 9. Jika vektor 𝑎 ̅ = ( 1 2 3 ), 𝑏 ̅ = ( 5 4 −1 ), dan 𝑐̅ = ( 4 −1 1 ), maka vektor 𝑎 ̅ + 2𝑏 ̅ - 3𝑐̅ adalah.. A. ( 6 11 −8 ) B. ( 7 13 −8 ) C. ( −1 12 −2 ) D. ( −1 13 −2 ) E. ( −6 −12 8 ) CARA :
  • 4. Jika 𝑏 ̅ = ( 𝑥 𝑦 𝑧 ) maka 2𝑏 ̅ = ( 2. 𝑥 2. 𝑦 2. 𝑧 ) 10. Diketahui vektor 𝑎 ̅ = ( −1 2 ), panjang vektor 𝑎 ̅ adalah .... A. 5 B. √3 C. √5 D. 1 E. 3 CARA : Jika vektor 𝑎 ̅ = ( 𝑥 𝑦) maka panjang vektor 𝑎 ̅ = √𝑥2 + 𝑦2 11. Diketahui vektor 𝑎 ̅ = ( 1 −2 3 ) dan 𝑏 ̅ = ( −2 3 0 ), vektor 𝑎 ̅ • 𝑏 ̅ = ..... A. – 8 B. -1 C. 8 D. 4 E. 5 CARA : Jika vektor 𝑎 ̅ = ( 𝑥1 𝑦1 𝑧1 ), 𝑏 ̅ = ( 𝑥2 𝑦2 𝑧2 ) maka vektor 𝑎 ̅ • 𝑏 ̅ = x1.x2 + y1.y2 + z1.z2 12. Diketahui vektor 𝑎 ̅ = 3𝑖̅ - 2𝑗̅ + 𝑘 ̅ dan 𝑏 ̅ = 2𝑖̅ + 𝑗̅ + p𝑘 ̅ , jika 𝑎 ̅ • 𝑏 ̅ = 6, maka nilai p = .. A. -3 B. 2 C. 3 D. 4 E. 6 13. Jika vektor 𝑎 ̅ dan vektor 𝑏 ̅ membentuk sudut 60° , |𝑎 ̅| = 2 dan |𝑏 ̅| = 5, maka nilai dari vektor 𝑎 ̅ • 𝑏 ̅ adalah... A. 5 B. 7 C. 9 D. 10 E. 4 CARA : vektor 𝑎 ̅ • 𝑏 ̅ = |𝑎 ̅|. |𝑏 ̅| . Cos 60° nilai Cos 0° = 1 Cos 30° = 1 2 √3
  • 5. Cos 45° = 1 2 √2 Cos 60° = 1 2 Cos 90° = 0 14. Jika 𝑎 ̅ = 3𝑖̅ - 2𝑗̅ + 𝑘 ̅ , 𝑏 ̅ = 2𝑖̅ - 4𝑗̅ - 3𝑘 ̅ dan 𝑐̅ = −𝑖̅ + 2𝑗̅ + 2𝑘 ̅ maka 2𝑎 ̅ - 3𝑏 ̅ - 5𝑐̅ adalah... A. 𝑖̅ - 2𝑗̅ - 5𝑘 ̅ B. −5𝑖̅ - 2𝑗̅ - 5𝑘 ̅ C. 2𝑖̅ - 5𝑗̅ - 𝑘 ̅ D. 5𝑖̅ - 2𝑗̅ + 𝑘 ̅ E. 5𝑖̅ - 2𝑗̅ CARA : Jika 𝑎 ̅ = 𝑎𝑖̅ + b𝑗̅ + c𝑘 ̅ , 𝑏 ̅ = 𝑑𝑖̅ + e𝑗̅ + f𝑘 ̅ dan 𝑐̅ = 𝑔𝑖̅ + h𝑗̅ + i𝑘 ̅ Maka 2𝑎 ̅ = 2. 𝑎𝑖̅ + 2.b𝑗̅ + 2.c𝑘 ̅ 15. Jika 𝑎 ̅ = ( 3 −2 ) , 𝑏 ̅ = ( 1 0 ) dan 𝑐̅ = ( −5 4 ) maka panjang 𝑑̅ = 𝑎 ̅ + 𝑏 ̅ − 𝑐̅ adalah... A. √5 B. 2√13 C. √37 D. 3√13 E. -2√41 16. Diketahui 𝑎 ̅ = ( 1 2 0 ) dan 𝑏 ̅ = ( −2 1 3 ), besar sudut antara vektor 𝑎 ̅ dan vektor 𝑏 ̅ adalah .. A. 30° B. 90° C. 45° D. 120° E. 60° CARA : Cos ∝ = 𝑎 ̅ • 𝑏 ̅ |𝑎 ̅|.|𝑏 ̅| 17. Jika sebuah persamaan kuadrat x2 - 3x + 2. Maka nilai a, b dan c adalah : A. 1, -3, 2 B. 1, 3, 2 C. 1, -3, -2 D. 1, 3, -2 E. 2, 5 dan 8 18. Jika sebuah persamaan kuadrat x2 - 6. Maka nilai a, b dan c adalah : A. 1, -6, 1 B. 1, -6, 0 C. 1, 0, -6 D. 1, 0, 6 E. -2, 3 dan 5 19. Jika Bentuk umum dari persamaan x2 - 16 = 7(x - 4) adalah ax2 + bx + c = 0, maka nilai a, b, c secara berturut-turut adalah : A. 1, -7 dan 12 B. 1, 7 dan 12 C. 1, -16 dan 7 D. 1, 7 dan 20
  • 6. E. -2, 6 dan 5 20. Diketahui 𝑓(𝑥) = 2𝑥 + 5 𝑑𝑎𝑛 𝑔(𝑥) = 𝑥−1 𝑥+4 , 𝑥 ≠ −4, maka (𝑓 ° 𝑔)(𝑥) = ⋯ A. 7𝑥−2 𝑥+4 ,𝑥 ≠ −4 B. 2𝑥+3 𝑥+4 ,𝑥 ≠ −4 C. 2𝑥+2 𝑥+4 ,𝑥 ≠ −4 D. 7𝑥+18 𝑥+4 , 𝑥 ≠ −4 E. 7𝑥+22 𝑥+4 , 𝑥 ≠ −4 CARA : (𝑓 ° 𝑔)(𝑥) = 𝑓(𝑔(𝑥)) = 𝑓( 𝑥−1 𝑥+4 ) = 2( 𝑥−1 𝑥+4 )+ 5 = 2𝑥−2 𝑥+4 + 5 = 2𝑥−2+5(𝑥+4) 𝑥+4 = 2𝑥−2+5𝑥+20 𝑥+4 = 7𝑥+18 𝑥+4 21. Diketahui fungsi f dengan rumus f(x) = 2x – 3 dan f-1 adalah fungsi invers dari f. Nilai dari f-1(-1) = ... A. -12 B. -1 C. 1 D. 2 E. 3 CARA : f(x) = 2x – 3 y = 2x – 3 y + 3 = 2x x = 𝑦+3 2 f-1(x) = 𝑥+3 2 f-1(-1) = −1+3 2 = 2 2 = 1 22. Diketahui fungsi 𝑓: 𝑅 → 𝑅 𝑑𝑒𝑛𝑔𝑎𝑛 𝑓(𝑥) = 3𝑥+1 2𝑥−2 untuk 𝑥 ≠ 1. Invers fungsi f adalah... A. 2𝑥+1 2𝑥+3 B. 2𝑥−3 2𝑥+1 C. 3𝑥−2 2𝑥+1 D. 2−3𝑥 2𝑥−1 E. 2𝑥+1 2𝑥−3 CARA : Invers 𝑓(𝑥) = 𝑎𝑥+𝑏 𝑐𝑥+𝑑 adalah 𝑓−1(𝑥) = −𝑑𝑥+𝑏 𝑐𝑥−𝑎 23. Diketahui fungsi f dan g yang ditentukan oleh 𝑓(𝑥) = 3𝑥2 + 𝑥 − 7 dengan 𝑔(𝑥) = 2𝑥 + 1.
  • 7. Maka (𝑓°𝑔)(𝑥) = ⋯ A. 3𝑥2 + 3𝑥 − 6 B. 6𝑥2 + 2𝑥 − 13 C. 12𝑥2 + 6𝑥 − 5 D. 12𝑥2 + 14𝑥 − 3 E. 12𝑥2 + 2𝑥 − 3 24. Fungsi 𝑓: 𝑅 → 𝑅 𝑑𝑎𝑛 𝑔: 𝑅 → 𝑅 ditentukan oleh 𝑓(𝑥) = 2𝑥 + 3 dan 𝑔(𝑥) = 𝑥2 + 𝑥 − 2. Nilai (𝑔 ° 𝑓)(−4) = ⋯ A. -20 B. -16 C. 0 D. 18 E. 23 25. Diketahui 𝑓(𝑥) = 3𝑥 + 2 𝑑𝑎𝑛 𝑔(𝑥) = 8x− 2 fungsi (f – g)(x) = ... A. -5x + 1 B. -5x + 4 C. -3x + 4 D. -3x + 3 E. -3x + 1
  • 8. Isilah Soal-soal Berikut Dengan Tepat dan Benar!! 26. Jika diketahui matriks A = ( 2 −1 3 −4 2 0 ) dan matriks B = ( 1 −1 3 −2 −1 2 ), maka matriks A.B adalah... 27. Diketahui titik A = (3, 1, -4) dan B = (3, -4, 6) . Tentukan besar vektor 𝐴𝐵 ̅̅̅̅ adalah... 28. Vektor-vektor 𝑎 ̅ = ( −3 1 −2 ) dan 𝑏 ̅ = ( −2 4 𝑥 ) adalah saling tegak lurus. Nilai x adalah... 29. Nilai fungsi invers 𝑓−1(2) 𝑑𝑎𝑟𝑖 𝑓(𝑥) = 3𝑥+4 2𝑥−1 , 𝑥 ≠ 1 2 adalah.. Diketahui f(x) = 2x2 – 2 dan g(x) = 1 2 𝑥 + 2, maka (𝑓°𝑔)(𝑥) adalah...