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Answer 1

Answer:

1. In linear algebra, a diagonal matrix is a matrix in which the entries outside the main diagonal are all zero; the term usually refers to square matrices
2. The scalar matrix is a square matrix in which all the off-diagonal elements are zero and all the on-diagonal elements are equal. We can say that a scalar matrix is a multiple of an identity matrix with any scalar quantity .
3. In linear algebra, the identity matrix of size n is the n × n square matrix with ones on the main diagonal and zeros elsewhere. It is denoted by Iₙ, or simply by I if the size is immaterial or can be trivially determined by the context.

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Answer 2

Answer:

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