Hi
No, how did you calculate it anyway?
Have you ever heard of "rule of Sarrus". I get : det() = +40
This is correct, well done
This is correct, too
No, it is
So it should be -4*21+24-48 = -108
By the way, nice solution!
Rapha
Hello all! I'd like to check these as I'm not very confident that I got them right, and I'd really appreciate your input, especially as I've scrambled my brains with trilingual madness! So much fun
Anywho here's the questions with my answers, are they right?
Evaluate the following determinants.
and
My answers;
and
And one more question;
Expand by minors
This question really bothers me considering that supposedly it doesn't matter which row or column you expand- you're supposed to get the same answer everytime, I'm getting a different answer each time.
Example, expanding the first row;
And if I expand the middle column;
Example, expanding the first row;
So... what am I doing wrong? D:
Thanks in advance for any help
Hi
No, how did you calculate it anyway?
Have you ever heard of "rule of Sarrus". I get : det() = +40
This is correct, well done
This is correct, too
No, it is
So it should be -4*21+24-48 = -108
By the way, nice solution!
Rapha
Ah thank you so much! Yeah, I had a serious case of brainfart here, how embarassing O: For the first question I used
but like an idiot I cast out some of the zeros D: e.g. not 15. However re-evaluating it, I get NEG 40, because
So then det = Right? Or am I being stupid again?
Ah crap! I wrote my original question wrong! The question was so I'm so sorry you guys, I'm usually not this bad about making mistakes D: Like I said, I think I scrambled my brains a bit, I stayed up 22 hours straight after only 4 hours of sleep (Nice excuse amirite? I'm retarded BAAWWW)
So it is -40 then right? Thank you so much for helping my stupid ass D':