Matrices are one of the easiest things you learn in Algebra II but there is no point of the matrix after high school.
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how is matrices is applicable in our life?
Matrices were used to organize data.
Inverse matrices are defined only for square matrices.
it cant, its just a useful thing that you will be tested on and asked to know this stuff for the rest of your life probably for no reason because there is no reason to use this in the real world so there ya go, sorry!
No. Multiplication of matrices is, in general, non-commutative, due to the way multiplication is defined.