Exercises 15-24 concern arbitrary matrices A, B, and C for which the
indicated sums and products are defined. Mark each statement True or False
(T/F). Justify each answer.
15. (T/F) If A and B are 2 × 2 with columns a₁, a2, and b₁,b2, respectively,
then AB = [a₁b₁a₂b²].
Consider the matrix distributive property.
(c + d)A = cA + dA, where A is a matrix and c and d are scalars
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Which of the following proves this property? Let A
0 ( + )A = (c + d) ] = [c+ d9aj] = [(c + a») · (a + a4) = [] + [daj] = c[»,] -
(c + a) ] = c[»] • «•«] = [ (-
= cA + dA
= CA + dA
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+ d)a;
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= CA + dA
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[Me]p+ [Me]> = ["ep] + [Me] = ["ep + Pe] = ["e(p + 2)] = ["e]co + >) = v(p + 2) O
= CA + dA
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0(c+ OJA = ([] + [«J])W - J) • [•rJ] - [a) + [da] = cA + da
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= CA + dA
Chapter 1 Solutions
Thomas' Calculus and Linear Algebra and Its Applications Package for the Georgia Institute of Technology, 1/e
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