Continuing we see that on 1 the graph of y hx is above

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Unformatted text preview: tote of the graph of a function y = f (x) if as x → c− or as x → c+ , either f (x) → ∞ or f (x) → −∞. 2 3 We would need Calculus to confirm this analytically. Here, the word ‘larger’ means larger in absolute value. 4.1 Introduction to Rational Functions 235 Definition 4.3. The line y = c is called a horizontal asymptote of the graph of a function y = f (x) if as x → −∞ or as x → ∞, either f (x) → c− or f (x) → c+ . In our discussion following Example 4.1.1, we determined that, despite the fact that the formula for h(x) reduced to the same formula as f (x), the functions f and h are different, since x = 1 is in the x2 − −2 domain of f , but x = 1 is not in the domain of h. If we graph h(x) = 2x2 −11 − 3x−1 using a graphing x2 calculator, we are surprised to find that the graph looks identical to the graph of y = f (x). There is a vertical asymptote at x = −1, but near x = 1, everything seem fine. Tables of values provide numerical evidence which supports...
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This note was uploaded on 05/03/2013 for the course MATH Algebra taught by Professor Wong during the Fall '13 term at Chicago Academy High School.

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