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PH FUNGSI KOMPOSISI/INVERS

Total questions: 10

Worksheet time: 50mins

Name
Class
Date
1.

Jika f(x) = 3x-2 dan g(x)=x²-6x+9 maka (f o g)(x) = . . .

a)

3x²-18x+25

b)

2x²+8x+4

c)

x²+4x+2

d)

3x²+18x+25

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.

Jika f(x)=4x2+5f\left(x\right)=4x^2+5 dan g(x)=1x−4g\left(x\right)=\frac{1}{x-4}  , maka nilai dari (𝑓 oo 𝑔)(6) adalah..........

a)

6

b)

4

c)

3

d)

-1

e)

-5

4.

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}

5.

Diketahui  f(x)=x+12x−4f\left(x\right)=\frac{x+1}{2x-4}  . Jika  f−1(x)f^{-1}\left(x\right)  merupakan invers fungsi f(x), maka nilai dari  f−1(2)f^{-1}\left(2\right)  adalah ...

(a)  

6.

f(x)=4x+36−5x, f−1(x) adalah...f\left(x\right)=\frac{4x+3}{6-5x},\ f^{-1}\left(x\right)\ adalah...

a)

A. 6x−35x−4A.\ \frac{6x-3}{5x-4}  

b)

B. 4x−35x+6B.\ \frac{4x-3}{5x+6}  

c)

C. 6x−53x+4C.\ \frac{6x-5}{3x+4}  

d)

D. 6x+35x+4D.\ \frac{6x+3}{5x+4}  

e)

E. 6x−35x+4E.\ \frac{6x-3}{5x+4}  

7.

f−1(x)=x−15dan g−1(x)=3−x2, (fo g)−1(6) =...f^{-1}\left(x\right)=\frac{x-1}{5}dan\ g^{-1}\left(x\right)=\frac{3-x}{2},\ \left(fo\ g\right)^{-1}\left(6\right)\ =...  

a)

A. 1

b)

B. 2

c)

C. 3

d)

D. 4

e)

E. 5

8.

Diketahui f(x)=xx−1f\left(x\right)=\frac{x}{x-1}

untuk  x≠1x\ne1 . Fungsi invers  f(x)f\left(x\right)  adalah ...

a)

xx+1\frac{x}{x+1}  

b)

xx−1\frac{x}{x-1}  

c)

x−1x\frac{x-1}{x}  

d)

1x−1\frac{1}{x-1}  

e)

1x+1\frac{1}{x+1}  

9.

Jika f(x) = x – 3 dan g (x) = 3 – 2x, maka  (f ∘ g)−1=\left(f\ \circ\ g\right)^{-1}=   adalah 

a)

2x2x  

b)

3−12x3-\frac{1}{2}x  

c)

−12x-\frac{1}{2}x  

d)

−2x-2x  

e)

12x−3\frac{1}{2}x-3  

10.

Diketahui g(x)=3x+2g\left(x\right)=3x+2  dan  (f o g)(x)=3x+23x+1; x≠−13\left(f\ o\ g\right)\left(x\right)=\frac{3x+2}{3x+1};\ x\ne-\frac{1}{3}  . Rumus fungsi  f(x)=....f\left(x\right)=....  

a)

x3x+2; x≠−23\frac{x}{3x+2};\ x\ne-\frac{2}{3}  

b)

xx+2; x≠−2\frac{x}{x+2};\ x\ne-2  

c)

xx−1; x≠1\frac{x}{x-1};\ x\ne1  

d)

3x3x−1; x≠13\frac{3x}{3x-1};\ x\ne\frac{1}{3}  

e)

3x3x−3; x≠1\frac{3x}{3x-3};\ x\ne1