Please help me find the Determinant of each matrix. DO NOT use a calculator. Show work. picture below:

Question

Please help me find the Determinant of each matrix.  DO NOT use a calculator.  Show work. picture below:

jdoe0001 · Answer

$5?   hehe

anonymous · Answer

|dw:1369169416562:dw|

anonymous · Answer

sorry my picture sucks :/

anonymous · Answer

$$\Delta = -1(2)-3(2)=-2-6=-8$$

anonymous · Answer

that was for your first matrix

anonymous · Answer

what's with the triangle?

jdoe0001 · Answer

do you know how to find the determinant of "a", the 2x2 one?

anonymous · Answer

$$\Delta= -2(0*1-(-1)8)-4(3-(-1)1)+1(3*8-1*0)=-2+8-16+24=14$$

anonymous · Answer

delta is the determinant of matrix

loser66 · Answer

you don't understand, right?

jdoe0001 · Answer

hehe

anonymous · Answer

I'm sorry guys my computer was messing up and no i don't understand lol

loser66 · Answer

ok, neither I. wonder how they guide on that way.

loser66 · Answer

you have ways to figure out the determinant of 2x2 matrix and 3x3 matrix. do you know them?

anonymous · Answer

nope i just understand how to add and multiply 2x2 matrixes

loser66 · Answer

ok, I guide, you work. deal?

loser66 · Answer

don't wait for my answer, I will not give you. but if you are willing to study, I am willing to help.

loser66 · Answer

Mr. Jim_Thomson is a perfectly patient helper. You are safe. 
@jim_thompson5910 help him, please.

jim_thompson5910 · Answer

The determinant of this general 2x2 matrix 

|dw:1369171941697:dw|

is

D = a*d - b*c