How to evaluate the left hand limit algebraically with a radical

The video tutorial discusses the ineffectiveness of drug substitution and explores the concept of rationalizing the radical, highlighting its limitations. It then shifts focus to understanding limits and approaching asymptotes, using smaller numbers to determine left-hand limits as a function approaches a specific value.

What values are we considering when approaching 9 from the left?

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Why is the limit as X approaches 9 from the left equal to negative infinity?

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