Evaluation at x = <whatever value was substituted>.
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A function of x means that the answers depends on the value of x that is substituted into the function. For example: y = x + 1 If x = 1, y = 2 If x = 2, y = 3 and so on.
if f(x) = 3x - 10, then whatever is put (substituted) for x in the "f(x)" bit is substituted for x in the "3x - 10" bit. Thus f(2a) = 3(2a) - 10 = 6a - 10.
algebraic expressions
It is the input value to the function called "f(x)" If f(x)= x + 1, an input value of 2 ( x equals 2) would give us 2 + 1, or 3.
A function is an equation (a relation) which has only one y-value for every x-value. If a single x-value has more than one y-value, the equation is no longer called a function.