Question on lim x→2 f(4x^2 − 11) = 8?

  • Thread starter Thread starter alaa amed
  • Start date Start date
Click For Summary
SUMMARY

The limit statement lim x→2 f(4x^2 − 11) = 8 is evaluated based on the continuity of the function f at the point 5, where f(5) = 8 and f(4) = 3. Since g(x) = 4x^2 - 11 is continuous and approaches 5 as x approaches 2, the composition of the continuous functions confirms that lim x→2 f(4x^2 − 11) indeed equals f(5), which is 8. Therefore, the statement is true.

PREREQUISITES
  • Understanding of limits and continuity in calculus
  • Familiarity with function composition
  • Knowledge of the properties of continuous functions
  • Basic algebraic manipulation of polynomial functions
NEXT STEPS
  • Study the properties of continuous functions in calculus
  • Learn about function composition and its implications for limits
  • Explore the concept of limits approaching specific values
  • Review examples of polynomial functions and their limits
USEFUL FOR

Students studying calculus, particularly those focusing on limits and continuity, as well as educators looking for examples of limit evaluation techniques.

alaa amed
Messages
19
Reaction score
0

Homework Statement



Determine whether the statement is true or false.
If f is continuous at 5 and f(5) = 8 and f(4) = 3, then
lim x→2 f(4x^2 − 11) = 8.

2. Homework Equations

lim x->a f(x) = f(a)

The Attempt at a Solution



I think the answer to this question is false because limit of f(4x^2 − 11) has to be approaching 8 but I am not sure if this is the right way ti think about this.[/B]
 
Physics news on Phys.org
Write ##x\mapsto f(4x^2 − 11)## as the composition of two functions ##f## and ##g##, where ##g(x)=4x^2-11##.
Is ##g## continuous?
What can we say about the composition of two continuous functions?
 

Similar threads

Replies
2
Views
2K
  • · Replies 6 ·
Replies
6
Views
2K
  • · Replies 2 ·
Replies
2
Views
1K
Replies
15
Views
2K
  • · Replies 13 ·
Replies
13
Views
13K
  • · Replies 5 ·
Replies
5
Views
1K
  • · Replies 4 ·
Replies
4
Views
1K
  • · Replies 2 ·
Replies
2
Views
2K
  • · Replies 10 ·
Replies
10
Views
7K
  • · Replies 11 ·
Replies
11
Views
2K