For f (x) = 3x + 2, find f (x) when x=4 and when x = - 1

Find f (x) when x = 4

Subtitute the x with 4 in the function

f (x) = 3x + 2

f (4) = 3 (4) + 2

f (4) = 12 + 2

f (4) = 14

The value of f (x) when x = 4 is 14

Find f (x) when x = - 1

Subtitute the x with - 1 in the function

f (x) = 3x + 2

f (-1) = 3 (-1) + 2

f (-1) = - 3 + 2

f (-1) = 1

The value of f (x) when x = - 1 is 1