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Easy: Adding and subtracting
Matrices of the same size add and subtract entry by entry: the entry in row 1, column 2 of A + B is the sum of the two row-1, column-2 entries. Multiplying by a number (a scalar) multiplies every entry. In an expression such as 2A − B, scale first, then subtract.
Simplify.
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No. Matrices are added entry by entry, so they must have the same number of rows and the same number of columns.
It multiplies every entry by that number. 3A triples each entry of A, and −A changes every sign.
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