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tankabanditka [31]
3 years ago
9

Use the limit theorem and the properties of limits to find the limit.

Mathematics
1 answer:
Irina-Kira [14]3 years ago
7 0

Answer:

b. \frac{2}{3}

Step-by-step explanation:

The given limit is

\lim_{x \to \infty} \frac{-2x^3+7x+2}{-3x^3-x+2}

We divide the numerator and the denominator by x^3

\lim_{x \to \infty} \frac{\frac{-2x^3}{x^3}+\frac{7x}{x^3}+\frac{2}{x^3}}{\frac{-3x^3}{x^3}-\frac{x}{x^3}+\frac{2}{x^3}}

This simplifies to;

\lim_{x \to \infty} \frac{-2+\frac{7}{x^2}+\frac{2}{x^3}}{-3-\frac{1}{x^3}+\frac{2}{x^2}}

Apply the following limit property;

As x\rightarrow -\infty, \frac{c}{x^n} \rightarrow 0, where c is a constant.

This implies that;

\lim_{x \to \infty} \frac{-2+\frac{7}{x^2}+\frac{2}{x^3}}{-3-\frac{1}{x^3}+\frac{2}{x^2}}=\frac{-2+0+0}{-3-0+0}

\therefore \lim_{x \to \infty} \frac{-2x^3+7x+2}{-3x^3-x+2}=\frac{2}{3}

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