Calculus to Sketch a Curve, Example 3

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This is exactly the review I needed. Thanks, Patrick!

wolf
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at 4:35 when you did the first deriv., you mentioned that -3, +3 would be vertical asymptotes. so how come it wasn't on the graph?

Fanchen
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because -x^2 is already a positive number, think (-x times -x) that = a positive number, so there is no need to write it with a plus.

Gdaydrian
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but 3 and -3 are not interior points in the domain !!!1 how can you take them as critical point

haidynagi