College Algebra / Unit 5 Alg 235 short lesson, about 20 seconds
Evaluating a Function
Captions available
The idea
Evaluating a function means substituting the input for every appearance of the variable and computing the output.
In practice
For f(x) = 2x + 3: f(4) = 2(4) + 3 = 11. The input 4 replaces x everywhere x appears.
Where people slip
Substitute in parentheses; the input arrives as a block.
Your place on the trail
Every lesson rests on earlier ones and opens later ones. Tap any to jump.
Builds on
- Nothing. This is a starting point.
Unlocks
- Nothing yet depends on this.
Something wrong in this lesson? Flag it · Sources for College Algebra