Additivity Integration Problem

  • Thread starter Thread starter rrrright
  • Start date Start date
  • Tags Tags
    Integration
Click For Summary
SUMMARY

The discussion centers on the Additivity Integration Problem, specifically the application of the properties of definite integrals. The key equations referenced are the additivity property of integrals, stated as \(\int_a^{b} f(x)dx + \int_b^{c} f(x)dx = \int_a^{c} f(x)dx\) and the reversal property \(\int_b^{a} f(x)dx = -\int_a^{b} f(x)dx\). Participants identify an error in the answer key, suggesting it omits a negative sign in the final result, leading to confusion regarding the correct evaluation of the integrals.

PREREQUISITES
  • Understanding of definite integrals and their properties
  • Familiarity with the notation and manipulation of integrals
  • Knowledge of the Fundamental Theorem of Calculus
  • Basic algebraic skills for handling expressions involving integrals
NEXT STEPS
  • Review the properties of definite integrals, focusing on additivity and reversal
  • Practice solving definite integrals using various functions
  • Explore the Fundamental Theorem of Calculus in greater depth
  • Investigate common errors in integral evaluation and how to avoid them
USEFUL FOR

Students studying calculus, particularly those focusing on integral calculus, educators teaching integration concepts, and anyone seeking to clarify common mistakes in evaluating definite integrals.

rrrright
Messages
5
Reaction score
0

Homework Statement



View attachment latex-image-1.pdf equals...

Homework Equations



\int_a^{b} f(x)dx+\int_b^{c} f(x)dx=\int_a^{c} f(x)dx

\int_b^{a} f(x)dx=-\int_a^{b} f(x)dx

The Attempt at a Solution



View attachment latex-image-1.pdf

View attachment latex-image-2.pdf

\int_2^{-1} f(x)dx-\int_2^{5} f(x)dx

\int_2^{-1} f(x)dx+\int_5^{2} f(x)dx

\int_5^{-1} f(x)dx

The answer key says the answer is View attachment latex-image-3.pdf Where did i go wrong?
 
Last edited:
Physics news on Phys.org
rrrright said:

Homework Statement



View attachment 30603 equals...

Homework Equations



\int_a^{b} f(x)dx+\int_b^{c} f(x)dx=\int_a^{c} f(x)dx

\int_b^{a} f(x)dx=-\int_a^{b} f(x)dx

The Attempt at a Solution



View attachment 30603

View attachment 30604

\int_2^{-1} f(x)dx-\int_2^{5} f(x)dx

\int_2^{-1} f(x)dx+\int_5^{2} f(x)dx

\int_5^{-1} f(x)dx

The answer key says the answer is View attachment 30605 Where did i go wrong?

I get
-\int_{-1}^{5} f(x)dx
which is the same as what you got. It looks to me like the answer key is missing the - sign out front.
 

Similar threads

  • · Replies 5 ·
Replies
5
Views
2K
Replies
9
Views
2K
Replies
4
Views
2K
  • · Replies 9 ·
Replies
9
Views
2K
Replies
12
Views
2K
  • · Replies 2 ·
Replies
2
Views
2K
Replies
2
Views
1K
Replies
21
Views
2K
  • · Replies 31 ·
2
Replies
31
Views
5K
  • · Replies 105 ·
4
Replies
105
Views
11K