Cramer's Rule

[kidmo87]

Hello everyone, first let me apologize if I have put this question in the wrong forum. I am struggling with Cramer's Rule for my engineering class. I have looked on the internet, but what's throwing me off is that some of the numbers involve the letter j which represents the imaginary number. Can someone explain to me how to do it? Thanks. I also placed the answer in the picture. Thanks

 

[stapel]

Yes, some texts use "j" for the "imaginary", in order to distinguish the "imaginary" from the designator for current.

However, I can't imagine how a ratio of determinant expressions (which should result in a rational expression) is ending up being a multiple of an angle measure (I think). It might help if you posted the entire exercise, so we had the context. Thank you!

 

[kidmo87]

Don't know how to solve for I1 and I2

 

[kidmo87]

My book has this as the answer, but don't know how to get it. Thanks

 

[Deleted member 4993]

View attachment 2900 My book has this as the answer, but don't know how to get it. Thanks

Do you know how to find determinant of 2X2 matrix?

Please share your work with us.

You need to read the rules of this forum. Please read the post titled "Read before Posting" at the following URL:

http://www.freemathhelp.com/forum/th...217#post322217

We can help - we only help after you have shown your work - or ask a specific question (e.g. "are these correct?")

 

[kidmo87]

Sorry, I did as much work as I can on paper, its just I use that paint application so I can paste the picture on here and it takes really long. But on the bright side, I FINALLY figured it out and understand it. Thanks for your assistance everyone.