Dividing rational expressions | Precalculus | Khan Academy

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When we divide rational expressions, we multiply the dividend (the first expression) by the reciprocal of the divisor (the second expression). We can also see if we can reduce the quotient to lowest terms. This is very similar to dividing fractions, only we also have to think about the domain while we do it.

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[wilbur]

Can somebody explain why x cannot be equal to 6? It seems to contradict with the practice on the site which says "The second and the first factor's denominator cannot be 0." I also tried the factor on desmos on which (6, 0) appears as a grey dot. Does anyone know what the color represents? Thanks

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Hey could u please solve this expression using long division
16xy-24y²+8x²z-12xyz/4xz+8y

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