Discuss continuity of the composite function

In summary, we discussed the continuity of a composite function h(x) = f(g(x)) with two different sets of functions. We learned that h is continuous at a point a if f is continuous at g(a). We also discussed how to determine the values of x where f(x) may be discontinuous. Finally, we saw an example of a function that is discontinuous at a specific value of x.
  • #1
louie3006
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Homework Statement

:
discuss continuity of the composite function h(x)=f(g(x)) when A} F(x)=X^2 , g(x) = x-1
B} f(x) = 1/x-6 , g(x) = X^2+5
where should I start ?
 
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  • #2


h is continuous at a point a if f is continuous at g(a)
 
  • #3


and how can we find out what a is if we are not given a number for a ?
 
  • #4


Consider all numbers! At what values of x is f(x)= 1/(x- 6) NOT continuous? (That's the crucial question.)
 
  • #5


when x = -6, that would make f(x) = 1/x-6 discontinuous right?
 
  • #6


louie3006 said:
when x = -6, that would make f(x) = 1/x-6 discontinuous right?
Please use parentheses.
If you mean f(x)= (1/x)- 6, then f(-6)= -1/6- 6= -37/6. No this function is not discontinuous at -6.

If you mean f(x)= 1/(x- 6), then f(-6)= 1/(-6-6)= -1/12. No this function is not discontinuous at -6.

Be more careful!
 
  • #7


f(6) = 1/ (6-6) = 1/0 this function is discontinuous, right ?
 

1. What is a composite function?

A composite function is a function that is formed by combining two or more functions in a specific order. The output of one function becomes the input of another function, resulting in a new function.

2. How is continuity defined in a composite function?

In a composite function, continuity is defined as the property of the function where the limit of the function at a given point is equal to the value of the function at that point. This means that there are no abrupt changes or breaks in the function.

3. What is the importance of continuity in a composite function?

The continuity of a composite function is important because it ensures that the function is well-defined and smooth. This means that the function can be graphed and analyzed without any interruptions or gaps, making it easier to understand and work with.

4. How can you determine the continuity of a composite function?

To determine the continuity of a composite function, you can use the continuity rules for composite functions. These rules state that if both individual functions are continuous at a given point, then the composite function is also continuous at that point.

5. What happens if one of the functions in a composite function is not continuous?

If one of the functions in a composite function is not continuous, then the entire composite function will also not be continuous at that point. This means that there will be a break or discontinuity in the function, which can affect the overall behavior and analysis of the function.

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