SOLUTION: Find the inverse of the matrix if it exists. A= [3,-1,0] [4,1,0] [0,0,4] A^-1=

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Question 626896: Find the inverse of the matrix if it exists.
A=
[3,-1,0]
[4,1,0]
[0,0,4]
A^-1=
Answer by ewatrrr(24785)   (Show Source): You can put this solution on YOUR website!
 

Hi,

A= =

I. find value of determinant =  a1(b2c3-c2b3) - b1(a2c3-c2a3) + c1(a2b3-b2a3) = 28

II. Then Apply formula for the Inverse:

 = 1/d



  = 1/28

 

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