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Algebra 1 · Functions

Evaluate f(x)

Evaluate the function at the given input. Enter the exact value.

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What you’ll learn

Evaluate the function at the given input. Enter the exact value.

Key idea

The argument is the input. Substitute it for x in the rule, then simplify the resulting exact value.

Worked example

Evaluate the function at the given input. Enter the exact value.

f(x) = 3x + 4; find f(-5/4)

  1. The argument -5/4 is the input, so substitute it for x.
  2. Evaluate 3(-5/4) + 4 to obtain 1/4.

Answer: 1/4

Quick Check

Choose the statement that correctly interprets the function notation.

f(-6) = -12

Choose one answer

Show a hint

Look inside the parentheses to identify the input.

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