College Algebra / Unit 7 Alg 378 short lesson, about 20 seconds
Removable Discontinuities
Captions available
The idea
A removable discontinuity — a hole — sits at a denominator zero whose factor cancels; the value stays excluded anyway.
In practice
In (x² − 9)/(x² + 5x + 6), the factor x + 3 cancels; the graph is (x − 3)/(x + 2) minus one point — a hole at (−3, 6).
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.
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