CBSE Class 12 Maths Notes: Matrices – Algebra of Matrices

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Addition and Subtraction of Matrices:

Any two matrices can be added if they are of the same order and the resulting matrix is of the same order.  If two matrices A and B are of the same order, they are said to be conformable for addition.

CBSE Class 12 Maths Notes: Matrices   Algebra of Matrices


All the laws of ordinary algebra hold for the addition or subtraction of matrices and their multiplication by scalars.

(i).        If A and B be two matrices of the same order and if k be a scalar, then

k(A + B) = kA + kB

(ii).       If k1 and k2 are two scalars and if A is a matrix, then

(k1 + k2)A = k1A + k2A and k1(k2A) = k2(k1A)

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