Changing the subject of a formula

  • Thread starter chuckienz
  • Start date
  • #1
2
0

Main Question or Discussion Point

Ok, this most likely will be a silly question but im having trouble trying to make X the subject of the formula XA +BA = B

im hoping someone is able to enlighten me

Thanks
 

Answers and Replies

  • #2
matt grime
Science Advisor
Homework Helper
9,395
3
What are X, A and B? It matters as it tells you what rules of manipulation are valid.

You can certainly subtract BA from both sides:

XA = B-BA

Now you need to 'divide' by A. If this is about real numbers, X=(B-BA)/A.

(If it were matrices then assuming A is invertible, X=(B-BA)A^-1.)
 

Related Threads for: Changing the subject of a formula

Replies
2
Views
1K
Replies
1
Views
2K
Top