\lim_{x \to 4} \frac{x^2 - 16}{x^2 + 5x - 36}
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The denominator is x^2 + 5x - 36. We can factor this quadratic equation by finding two numbers that multiply to -36 and add up to 5. The numbers are 9 and -4, so we can factor the denominator as (x + 9)(x - 4). Show more…
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