Give examples of function
f(x) = 3x + 5
f(x) = 6x^2 + 1
g(x) = 22 - 8x^3
H(x) = 14x^2 + 52x^3 - 8√x
It can really be any algebraic expression. A function is defined as "a relation from a set of inputs to a set of possible outputs where each input is related to exactly one output."
For example, in f(x) = 3x + 5
f(1) = 3(1) + 5 = 8
f(8) = 3(8) + 5 = 29
etc.
(i.e. you just substitute the values of x).