Determine the end behaviour of the function
$\displaystyle P(x) = 2x^2 - x^{12}$. Compare the graphs of $P$ and $\displaystyle Q(x) = -x^{12}$ on large and small viewing rectangle.
The function $P(x)$ has an even degree of 12 and a negative leading coefficient. Thus, its end behaviour is $y \rightarrow -\infty \text{ as } x \rightarrow -\infty \text{ and } y \rightarrow -\infty \text{ as } x \rightarrow \infty$.
The graph shows the function $P$ and $Q$ in progressively larger viewing rectangle. The larger the viewing rectangle, the more the graphs aline. This confirms that they have the same end behaviour.
Tuesday, August 20, 2019
College Algebra, Chapter 4, 4.2, Section 4.2, Problem 46
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