If f (x) = 3x + 7, find:

f (3) = [? ]

f (3) = 16

Step-by-step explanation:

f (x) = 3x + 7

Let x = 3

f (3) = 3*3 + 7

= 9+7

= 16

Answer: 16

Step-by-step explanation: f (x) = 3x + 7 means that if we put an x into our function, a 3x + 7 comes out.

So if we want to find f (3), we're putting a 3 into our function which means that a 3 (3) + 7 comes out which simplifies to 9 + 7 or 16.

So f (3) = 16 or the value of the function at 3 equals 16.