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Homework Statement
|A| + |B| = |C|
where
A=
[a_11 a_12 a_13]
[a_21 a_22 a_23]
[a_31 a_32 a_33]
B=
[b_11 b_12 b_13]
[b_21 b_22 b_23]
[b_31 b_32 b_33]
C=
[(a_11 + b_11) a_12 a_13]
[(a_21 + b_21) a_22 a_23]
[(a_31 + b_31) a_32 a_33]
Homework Equations
?
The Attempt at a Solution
First I tried taking the determinants of all 3 matrices but it got like WAY too messy and I didnt see anything close to them being equal (since i got a lot of terms that involved a_ij x b_ij and I didnt get them on the other ones.
Then I researched a little and came across that
A=
[a_11 a_12 a_13] = [a_11 a_12 a_13] + [ 0 a_12 a_13] + [0 a_12 a_13]
[a_21 a_22 a_23] [0 a_22 a_23] [a_21 a_22 a_23] [0 a_22 a_23]
[a_31 a_32 a_33] [0 a_32 a_33] [0 a_32 a_33] [a_31 a_32 a_33]I think it goes somewhere around there but I keep getting lost and I don't know how to get around it.
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