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AP Calculus AB ยท Unit 1

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# Introduction to Limits

## Big Idea
A limit describes the value a function approaches as the input gets close to a specific number. The function does not have to equal that value at the point itself.

## Worked Example
Evaluate lim(x -> 3) (x^2 - 9) / (x - 3)

Factor the numerator:
x^2 - 9 = (x - 3)(x + 3)

Now cancel the common factor:
(x - 3)(x + 3) / (x - 3) = x + 3

So the limit is 6.

## Why Students Miss It
- plugging in too early and stopping at 0/0
- forgetting to factor before simplifying
- confusing the limit with the actual function value

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