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Unformatted text preview: MATH 006 Calculus and Linear Algebra (Lecture 14) Albert Ku HKUST Mathematics Department Albert Ku (HKUST) MATH 006 1 / 17 Outline 1 Algebraic Methods for Finding Limits 2 Indeterminate Form 3 Limits of the Difference Quotient Albert Ku (HKUST) MATH 006 2 / 17 Algebraic Methods for Finding Limits Algebraic Methods for Finding Limits From the properties of limits, we have the following fact: Suppose f ( x ) is a function which is defined by an expression that involves addition, subtraction, multiplication, division and/or powers of x . If f ( c ) is welldefined, then lim x → c f ( x ) = lim x → c f ( x ) = lim x → c + f ( x ) = f ( c ) Remark If f ( c ) is not welldefined, it does not necessarily mean that lim x → c f ( x ) does not exist. We will see more examples later. Albert Ku (HKUST) MATH 006 3 / 17 Algebraic Methods for Finding Limits Example Let f ( x ) = 3 √ x + 1 2 x 2 5 √ 3 x 2 2 x 1 . Find lim x → 2 f ( x ). Solution Since f (2) = 3 √ 3 8 5 √ 7 is welldefined, lim x → 2 f ( x ) = f (2) = 3 √ 3 8 5 √ 7 Albert Ku (HKUST) MATH 006 4 / 17 Algebraic Methods for Finding Limits Example Let f ( x ) = 3 √ x + 1 2 x 2 5 √ 3 x 2 2 x 1 . Find lim x → 1 f ( x ). Notice that as x tends to 1, the denominator will get close to 0 but the numerator will get close to 3 √ 2 2 6 = 0. You would expect the value of f will get larger and larger (positively or negatively, depending on the...
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This note was uploaded on 12/28/2010 for the course MATH MATH006 taught by Professor Forgot during the Fall '09 term at HKUST.
 Fall '09
 forgot
 Math, Calculus, Linear Algebra, Algebra, Limits

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