Calculus 1 - Introduction to Limits

This calculus 1 video tutorial provides an introduction to limits. It explains how to evaluate limits by direct substitution, by factoring, and graphically.
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[@TheOrganicChemistryTutor]

Full 40 Minute Videon on Patreon: www.patreon.com/MathScienceTutor Direct Link to Full Video on Patreon: bit.ly/3ztpb3n Next Video: kzbin.info/www/bejne/sH3Sq6qEm5qlY5o

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how do I find the limit of -3 in (2-sqrt1-x)/(x+3)?

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For the question at 8:23 (the one with the square root in the numerator), you could alternatively use difference of squares in the denominator with x-9, making it (rootx -3) (rootx + 3). The (rootx -3) can be "cancelled out" from the numerator and denominator, and you can save a lot of time in getting to 1 / (rootx+3) = 1/6.

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I just came across your video and I would like to ask if I can equally square both sides for the example on lim x->9 and if yes, I got a different answer 1/18 and yours is 1/6

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