Question

Let f be a function f : N$\to$ N defined by f (x) = 3x + 2, x $\in$ N. Find the images of 1, 2, 3.

• A. -5, 8, 11
• B. 5, 8, 11
• C. -5, -8, -11
• D. 5, 8, -11

Answer 1

The correct option is B 5, 8, 11

Given:
Function f : N$\to$ N defined by
f (x) = 3x + 2, x $\in$ N.
If x = 1, f (1) = 3(1) + 2 = 5
If x = 2, f (2) = 3(2) + 2 = 8
If x = 3 , f (3) = 3(3) + 2 = 11
Hence the images of 1, 2, 3 are 5, 8, 11 respectively.