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ULANGAN KOMPOSISI FUNGSI DAN INVERS FUNGSI

Total questions: 10

Worksheet time: 48mins

Name
Class
Date
1.

Jika 𝑓={(−1,1),(−5,−3),(2,7),(6,5)} dan 𝑔={(1,2),(3,−1),(5,6),(7,−5)}, maka (𝑔∘𝑓)(2)=......

a)

-5

b)

-1

c)

1

d)

2

e)

6

2.

Jika 𝑔(𝑥)=3𝑥−4 dan (𝑔∘𝑓)(𝑥)=−3𝑥2+6𝑥−4, maka 𝑓(𝑥) adalah......

a)

𝑥2−2𝑥

b)

𝑥2+2𝑥

c)

2𝑥−𝑥2

d)

2𝑥2−𝑥

e)

2𝑥2+𝑥

3.

Invers dari fungsi 𝑦=5𝑥−3 adalah.......

a)

y−1=5x+3y^{-1}=5x+3

b)

y−1=3−5xy^{-1}=3-5x

c)

y−1=5x−3y^{-1}=\frac{5}{x-3}

d)

y−1=x+35y^{-1}=\frac{x+3}{5}

e)

y−1=x−35y^{-1}=\frac{x-3}{5}

4.

Diketahui f(x)=3x+12f\left(x\right)=\frac{3x+1}{2} . Jika f−1(x)f^{-1}\left(x\right) merupakan invers dari fungsi 𝑓(𝑥), maka nilai dari  f−1(1)f^{-1}\left(1\right) adalah......

a)

-3

b)

−13-\frac{1}{3}  

c)

0

d)

13\frac{1}{3}  

e)

3

5.

Invers dari f(x)=3x+72x−1f\left(x\right)=\frac{3x+7}{2x-1}    adalah...

a)

x+72x−3\frac{x+7}{2x-3}  

b)

x−72x+3\frac{x-7}{2x+3}  

c)

2x−7x+3\frac{2x-7}{x+3}  

d)

2x+3x−7\frac{2x+3}{x-7}  

e)

x+32x−7\frac{x+3}{2x-7}  

6.

Jika f(x)=2x −1f\left(x\right)=2x\ -1  dan  g(x)=x2−2x+3g\left(x\right)=x^2-2x+3  maka  (fog)(x)=....\left(fog\right)\left(x\right)=....  

a)

2x2−4x+52x^2-4x+5  

b)

2x2−4x+72x^2-4x+7  

c)

2x2+4x−52x^2+4x-5  

d)

2x2+4x−72x^2+4x-7  

e)

2x2−4x−52x^2-4x-5  

7.

 Jika f(x)=2x−2f\left(x\right)=2x-2 ,  g(x)=3x−5g\left(x\right)=3x-5  , dan  h(x)=x−4h\left(x\right)=x-4  maka  (f o g o h)(x)=....\left(f\ o\ g\ o\ h\right)\left(x\right)=....  

a)

6x−326x-32  

b)

6x−366x-36  

c)

6x+326x+32  

d)

6x+366x+36  

e)

6x−196x-19  

8.

Jika f(x)=x+3f\left(x\right)=x+3  dan  (g o f)(x)=2x2−3x−4\left(g\ o\ f\right)\left(x\right)=2x^2-3x-4  maka  (g)(x)=....\left(g\right)\left(x\right)=....  

a)

2x2−15x+322x^2-15x+32  

b)

2x2+15x−232x^2+15x-23  

c)

2x2+15x+232x^2+15x+23  

d)

2x2−15x−232x^2-15x-23  

e)

2x2−15x+232x^2-15x+23  

9.

jika f(x)=2x+6f\left(x\right)=2x+6  dan  (f o g)(x)=x2+7x−2\left(f\ o\ g\right)\left(x\right)=x^2+7x-2  maka  g(x)=....g\left(x\right)=....  

a)

x2+7x−82\frac{x^2+7x-8}{2}  

b)

x2+7x+82\frac{x^2+7x+8}{2}  

c)

x2−7x−82\frac{x^2-7x-8}{2}  

d)

x2−7x+82\frac{x^2-7x+8}{2}  

10.

Jika f(x) = 3x + 4 dan g(x) = 6 - 2x, maka nilai dari (fog)(3) adalah ….

a)

-20

b)

-8

c)

4

d)

-10