SOLUTION: when you are subtracting a matrices how do you change the signs

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when you are subtracting a matrices how do you change the signs
You do the same thing you do when you subtract two things in parenthesis, change the sign of everything in the matrix behind the - and add the two matrices together.
[a+b]-[-c+d]=[a+b]+[c-d]
I hope that helps.
Happy Calculating!!!