Would this have been marked correct?

  • Thread starter Thread starter Gringo123
  • Start date Start date
Click For Summary

Homework Help Overview

The discussion revolves around the expansion of an algebraic expression involving brackets and the arrangement of terms. The original poster seeks clarification on whether their answer, which matches the book's answer but differs in term order, would be considered correct in an exam context.

Discussion Character

  • Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • The original poster presents their expanded expression and questions the validity of their answer in relation to the book's answer. Some participants affirm the correctness of the original poster's answer, while others introduce considerations about the commutativity of addition and its implications in different mathematical contexts.

Discussion Status

The discussion includes affirmations of the original poster's answer, with some participants suggesting that the arrangement of terms does not affect correctness in this case. However, there are also notes about potential exceptions in more advanced mathematical contexts, indicating a mix of perspectives without a definitive consensus.

Contextual Notes

Participants reference different educational standards and levels, suggesting that the interpretation of correctness may vary based on the context of the class or curriculum.

Gringo123
Messages
141
Reaction score
0
I had to expand the brackets in this expression:
2f[d+e+f]-2e[d+e+f]

My answer is:
2df + 2f2 -2de - 2e2

The answer in my book is the same but all the components are in different places:
-2e2 +2f2 -2de + 2df

Would my answer have been ok in an exam?
 
Physics news on Phys.org
Yes, definitely!

If you would have had any marks deducted, your teacher has issues.
 
Mentallic is right but it doesn't follow in every case but looking at your standard (may be class II) it is always right for you. In higher classes you will find something different. Like in vector multiplication A x B is not equal to B x A. similarly you'll find that A + B is not equal to B + A. But don't worry about it today.
 
Thanks a lot folks!
 

Similar threads

  • · Replies 105 ·
4
Replies
105
Views
6K
  • · Replies 21 ·
Replies
21
Views
2K
Replies
7
Views
2K
  • · Replies 4 ·
Replies
4
Views
21K
  • · Replies 4 ·
Replies
4
Views
3K
  • · Replies 11 ·
Replies
11
Views
4K
  • · Replies 4 ·
Replies
4
Views
2K
  • · Replies 3 ·
Replies
3
Views
2K
  • · Replies 1 ·
Replies
1
Views
2K
Replies
14
Views
906