To identify the leftmost vertical asymptote of a function, you generally need to know the equation of the function. Vertical asymptotes occur where the function becomes undefined, usually due to division by zero.

For a function $f(x)$, vertical asymptotes are found by setting the denominator of the function to zero and solving for $x$.

Could you provide the equation of the function you're working with? Then, I can help you find the leftmost vertical asymptote.

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Sample questions related to this topic:

1. How do you find vertical asymptotes for rational functions?
2. What are the horizontal asymptotes of a function, and how do they differ from vertical ones?
3. Can a polynomial function have vertical asymptotes?
4. How do you determine the behavior of a function near a vertical asymptote?
5. What happens when the numerator of a rational function also equals zero at the same point as the denominator?

Tip: Vertical asymptotes only occur at points where the denominator is zero and the numerator is not zero at the same time.