You have to give the function an

f(x)=3x-1, encrypted code:

23 14 35 35 44

f(8)=23

f(5)=14

f(12)=35

f(15)==44

Explanation:

Using the function f(x)=3x-1, the message "HELLO" would be encrypted 23 14 35 35 44 since H corresponds to 8 and f(8)=3(8)-1=23, etc.

H=8

E=5

L=12

L=12

O=15

the message "HELLO" would be encrypted 23 14 35 35 44

f(x)=3x-1

f(8)=3x-1 f(8)=3(8)-1 f(8)=24-1=23

f(5)=3x-1 f(5)=3(5)-1 f(5)=15-1=14

f(12)=3x-1 f(12)=3(12)-1 f(12)=36-1=35

f(12)=3x-1 f(12)=3(12)-1 f(12)=36-1=35

f(15)=3x-1 f(15)=3(15)-1 f(15)=45-1=44

Inverse function

y=3x13x=y+1x=3

y+1

f1

(x)=3

x+1

f1

(23)=3

23+1

=3

24

=8

f1

(14)=3

14+1

=3

15

=5

f1

(35)=3

35+1

=3

36

=12

f1

(44)=3

44+1

=3

45

=15

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