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Evaluating Functions in math

How Input Becomes Output

Two examples of function notation are the following:
  • f(x)  = 2x
  • h(x) =  x2

To evaluate a function, we insert a given x value, a number in the domain, and see what number we get, which is a number in a range.  Some examples:
The two functions below refer to functions listed up above.
  • To evaluate f(4)   f(4) = 2(4) = 8 We just evaluated f(x) for the value x = 4.
  • evaluate h(-2) (-2)2 = 4


Practice Problems


Practice Evaluating Functions

f(x) = 5x + 2
Evaluate f(2)
Answer

h(x) = 3x3 Evaluate h(2)
Answer

k(x) = 3x – 1 Evaluate k(-1)
Answer

s(x) = 2x2 – 2x Evaluate s(3)
Answer

B(x) = x2 – x3 Evaluate B(5)
Answer

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