- Math 1110 Practice Prelim 1 Solutions 1 Evaluate the following limits if they exist If the limits do not exist say why they do not exist a lim x

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Unformatted text preview: Math 1110 Practice Prelim 1 Solutions 1. Evaluate the following limits if they exist. If the limits do not exist say why they do not exist. a. lim x → 2 x 2 +3 x x b. lim x →- 1 x 3 c. lim x →- 3 x 2- x- 12 x +3 d. lim x →∞ √ 4 x 2 +2 x +1 3 x Solution: a. lim x → 2 x 2 +3 x x = 2 2 +3 · 2 2 = 5. b. If x is very small and negative, then x 3 is also very small and negative and so 1 x 3 is negative and has large absolute value. So lim x →- 1 x 3 =-∞ . c. lim x →- 3 x 2- x- 12 x +3 = lim x →- 3 ( x- 4)( x +3) x +3 = lim x →- 3 x- 4 =- 7. d. lim x →∞ √ 4 x 2 +2 x +1 3 x = lim x →∞ x q 4+ 2 x + 1 x 2 3 x = lim x →∞ q 4+ 2 x + 1 x 2 3 = √ 4 3 = 2 3 2. Determine the values of A and B so that the function f as defined below is continuous for all x . f ( x ) = Ax- B if x ≤ 1 x 2 + Bx- A if 1 < x ≤ 2 2 if x > 2 Solution: f is continuous for x < 1, 1 < x < 2 and x > 2 because it coincides with poly- nomials (which are continuous) on those open intervals. All we have to check is thatnomials (which are continuous) on those open intervals....
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This note was uploaded on 12/06/2010 for the course MATH 1110 taught by Professor Martin,c. during the Fall '06 term at Cornell University (Engineering School).

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- Math 1110 Practice Prelim 1 Solutions 1 Evaluate the following limits if they exist If the limits do not exist say why they do not exist a lim x

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