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(oo=inf)

Limx-->+oo (5^x - 7^x) 

 

  \(lim_{x\rightarrow +oo (5^x - 7^x)}\)  i wan to find the lim please help me!

 Jan 16, 2016

Best Answer 

 #2
avatar+104855 
+10

Here's a graphical solution: https://www.desmos.com/calculator/f7c6wqsvxl

 

Note....as x grows larger and larger, the value of 7^x  is much greater than 5^x......so......this function approaches [  -inf  ]  as x grows sufficiently large

 

Thus......the limit does not exist

 

 

 

cool cool cool

 Jan 16, 2016
 #1
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+5

Believe or not, when I plug it into my computer software, it comes back with this succinct message:

(no interesting limit points found)

 Jan 16, 2016
 #2
avatar+104855 
+10
Best Answer

Here's a graphical solution: https://www.desmos.com/calculator/f7c6wqsvxl

 

Note....as x grows larger and larger, the value of 7^x  is much greater than 5^x......so......this function approaches [  -inf  ]  as x grows sufficiently large

 

Thus......the limit does not exist

 

 

 

cool cool cool

CPhill Jan 16, 2016

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