Can someone work this problem out for me so I can understand how to do it and finish this test? .3.

What is the determinant of the matrix?
[5 6]
[2 9]
(It's all one big bracket.)

Question

Can someone work this problem out for me so I can understand how to do it and finish this test? .3.

What is the determinant of the matrix?
[5 6]
[2 9] 
(It's all one big bracket.)

shiraz14 · Answer

Det = ad - bc = 45-12 = 33

ria23 · Answer

:o oh. Thank yhu. ^.^

ria23 · Answer

. . . I can't get the next one. The answer I got isn't listed. ; n;

ria23 · Answer

What is the determinant of the matrix?
[-4 -5]
[2   -6]
I got 24-(-30)=  54
My choices are 34, 14, -14, -34.

ria23 · Answer

*Facepalm* Nevermind.

shiraz14 · Answer

How did you get the -30?

ria23 · Answer

xD I have no idea. I must have looked at that wrong.

shiraz14 · Answer

It should be (-4*-6)-(2*-5) = 24-(-10) = 24+10 = 34

ria23 · Answer

That's what I got. Thank yhu ^.^
I need help with 3 more questions, they're slightly different. Do yhu think yhu could walk me through how to do them?

shiraz14 · Answer

Post them in a different thread. Thanks.

ria23 · Answer

No problem. C: