Discontinuities of rational functions (video) | Khan Academy
https://www.khanacademy.org/math/precalculus/x9e81a4f98389efdf:rational-functions/x9e81a4f98389efdf:discontinuities-of-rational-functions/v/discontinuities-of-rational-functions
WebA removable discontinuity, also known as a hole, occurs when a factor is common to both the numerator and denominator of a rational function, causing a cancellation. If a factor (x−a) is in both the numerator and denominator, it can be canceled out, resulting in a simplified function without the discontinuity.
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