Skip to main content

Evaluating a Function

This video presents the same text shown beside it, spoken and on screen. It adds nothing the text does not say.

State

Evaluating a function means substituting the input for every appearance of the variable and computing the output.

Show

For f(x) = 2x + 3: f(4) = 2(4) + 3 = 11. The input 4 replaces x everywhere x appears.

Watch for

Substitute in parentheses; the input arrives as a block.

Builds on

  • Nothing — this is a starting point.

Unlocks

  • Nothing yet depends on this.