A community for students.
Here's the question you clicked on:
 0 viewing
DestisaurusRex
 2 years ago
How would you find the determinant of :
⎡3 2⎤
⎣6 4⎦ Without using a calculator?
DestisaurusRex
 2 years ago
How would you find the determinant of : ⎡3 2⎤ ⎣6 4⎦ Without using a calculator?

This Question is Closed

TheRealMeeeee
 2 years ago
Best ResponseYou've already chosen the best response.1ok You actually do it the same way for any size matrix: you pick a row and column, and multiply the value for each element in the row by the "cofactor" or "minor" (the smaller determinant found by eliminating the row and the column of the element that you're working with).  5 2 0 0 2   0 1 4 3 2   0 0 2 6 3   0 0 3 4 1   0 0 0 0 2  This particular matrix is pretty easy, because it has a lot of zeros. So if you start with the last row, you get: 2 x  5 2 0 0   0 1 4 3   0 0 2 6   0 0 3 4  Then, using the first column, you'd get: 2 x 5 x  1 4 3   0 2 6   0 3 4  Then again using the first column: 2 x 5 x 1 x  2 6   3 4  2 x 5 x 1 x (2 x 4  3 x 6) = 100

GirlByte
 2 years ago
Best ResponseYou've already chosen the best response.0@DestisaurusRex lol do not listen to this guy ^^^ he copies answers! he got it from here http://answers.yahoo.com/question/index?qid=20070123154335AAIVKZd

TheRealMeeeee
 2 years ago
Best ResponseYou've already chosen the best response.1omg no idid not u just a stalker

GirlByte
 2 years ago
Best ResponseYou've already chosen the best response.0Yes you did.You have the same words plus you did the same thing to the other questions.

GirlByte
 2 years ago
Best ResponseYou've already chosen the best response.0And its obvious its not from you cause you dont even know basic grammar

TheRealMeeeee
 2 years ago
Best ResponseYou've already chosen the best response.1omg girl no i didnt not stalker

alekos
 2 years ago
Best ResponseYou've already chosen the best response.1leave maths to the real mathematicians

alekos
 2 years ago
Best ResponseYou've already chosen the best response.1for a 2x2 determinant \[\left[\begin{matrix}a & b \\ c & d\end{matrix}\right]\] it's ad  bc

alekos
 2 years ago
Best ResponseYou've already chosen the best response.1no calculator required. should be able to do it in your head
Ask your own question
Sign UpFind more explanations on OpenStudy
Your question is ready. Sign up for free to start getting answers.
spraguer
(Moderator)
5
→ View Detailed Profile
is replying to Can someone tell me what button the professor is hitting...
23
 Teamwork 19 Teammate
 Problem Solving 19 Hero
 Engagement 19 Mad Hatter
 You have blocked this person.
 ✔ You're a fan Checking fan status...
Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.