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Answer :
To evaluate the given limit, we first need to simplify the expression inside the limit.
Let's start by simplifying the expression -3x³ - 21x - 30. We can factor out a common factor of -3 from each term: -3x³ - 21x - 30 = -3(x³ + 7x + 10). Next, we notice that x³ + 7x + 10 can be factored further: x³ + 7x + 10 = (x + 2)(x² - 2x + 5). Now, the expression becomes: -3(x + 2)(x² - 2x + 5). To evaluate the limit, we consider the behavior of the expression as x approaches negative infinity. As x approaches negative infinity, the term (x + 2) approaches negative infinity, and the term (x² - 2x + 5) approaches positive infinity. Multiplying these two factors by -3, we get: lim -3(x + 2)(x² - 2x + 5) = -3 * (-∞) * (+∞) = +∞.
Therefore, the limit of the given expression as x approaches negative infinity is positive infinity.
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