Another operation on matrices is scalar multiplication. Let k be a real number and A = [ aij ]be an m × n matrix. The result of multiplying A by the scalar k is the matrix kA = [ kaij ]. For Exercises, use the definition of scalar multiplication and the matrices given.
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Exercise
Compute each of the following.
(a) 3 (A + B)
(b) 3A + 3B
(c) − 2(AC)
(d) A(−2C)
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