I've tried a problem for a very long time but I can't seem to get it right (my answer is different from the one in my textbook).
Could you please tell me where I went wrong?
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Your inverse matrix is incorrect. You have correctly calculated the determinant but you also need to swap two entries and negate the other two.
Oh wait I'm sorry I did do the swapping and negating, I just forgot to include it in the image.
Could you show me how to solve it? Cause I still keep getting a wrong answer.
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