+0  
 
0
768
2
avatar+105 

need some help with the formula. 

E= 1 -1  1
     7 -8  5
    -4  5  3

 Jun 18, 2014

Best Answer 

 #1
avatar+129852 
+5

Here's the formula, Strider

The inverse of a 3x3 matrix:

| a11 a12 a13 |-1 | a33a22-a32a23 -(a33a12-a32a13) a23a12-a22a13 | | a21 a22 a23 | = 1/DET * | -(a33a21-a31a23) a33a11-a31a13 -(a23a11-a21a13) | | a31 a32 a33 | | a32a21-a31a22 -(a32a11-a31a12) a22a11-a21a12 | with DET = a11(a33a22-a32a23)-a21(a33a12-a32a13)+a31(a23a12-a22a13)

Can you do it, now...or do you need some help??? It's really just a "plug and play" problem....but kinda' lengthy...let me know

 Jun 18, 2014
 #1
avatar+129852 
+5
Best Answer

Here's the formula, Strider

The inverse of a 3x3 matrix:

| a11 a12 a13 |-1 | a33a22-a32a23 -(a33a12-a32a13) a23a12-a22a13 | | a21 a22 a23 | = 1/DET * | -(a33a21-a31a23) a33a11-a31a13 -(a23a11-a21a13) | | a31 a32 a33 | | a32a21-a31a22 -(a32a11-a31a12) a22a11-a21a12 | with DET = a11(a33a22-a32a23)-a21(a33a12-a32a13)+a31(a23a12-a22a13)

Can you do it, now...or do you need some help??? It's really just a "plug and play" problem....but kinda' lengthy...let me know

CPhill Jun 18, 2014
 #2
avatar+105 
0

thanks! i figured it out! 

 Jun 18, 2014

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