Quick question

  • Thread starter chukie
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  • #1
chukie
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k(x) is a continuous function. k(x)=-1 and k(4)=2 then is this statement true:

lim x->3- k(x) = lim x->3+ k(x)


i realli hv no idea. could sumone help me please?
 

Answers and Replies

  • #2
Dick
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What does continuous mean in terms of limits? k(x)=(-1) means the function is constant. k(4)=2 contradicts the previous statement. What's the real problem?
 
  • #3
chukie
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What does continuous mean in terms of limits? k(x)=(-1) means the function is constant. k(4)=2 contradicts the previous statement. What's the real problem?

sorry i typed the question wrong k(3)=-1
 
  • #4
Dick
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sorry i typed the question wrong k(3)=-1

S'ok. But the question is still odd, because the values of the function don't have anything to do with whether the two limits are equal. If a function is continuous at x=3, what can you say about it's left and right hand limits? Do you mean to say k(x) is only defined on the interval [3,4]? Or is it defined and continuous everywhere?
 
  • #5
chukie
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S'ok. But the question is still odd, because the values of the function don't have anything to do with whether the two limits are equal. If a function is continuous at x=3, what can you say about it's left and right hand limits? Do you mean to say k(x) is only defined on the interval [3,4]? Or is it defined and continuous everywhere?

k(x) is continuous for all real numbers
 
  • #6
Dick
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Fine. Then the values of the function have nothing to do with the problem. What does being continuous tell you about limits?
 
  • #7
chukie
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umm I am not exactly sure but the left hand limit should equal the right hand limit?
 
  • #8
Dick
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Pretty much. And they both should equal the value of the function at x=3. Kind of a silly question then, yes?
 
  • #9
chukie
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yes lol but thank you so much for ur help. it helped cleared things up for me.
 

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