Find function value f (6) if f (x) = 4x

Finding value of fuction is not very hard.

If we have function f (x) = 4x and we want to find value of f (6) it means that to find this value we just have to put 6 instead of x.

Lets do this

f (x) = 4x

f (6) = 4*6

f (6) = 24 - its the result.

Nice.

f (x) = 4x.

f (6) = 4 (6) We simply substitute x = 6.

f (6) = 24.