Matrices and Their Inverses

Question 1

Now calculate BA: Find d11 = ⇒ 1 d12 = d21 = d22 =

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Part 2: 0; Part 3: 0; Part 4: 1

Question 2

Question 10

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is commutative

Question 3

Find the elements of D.a = b = c = d = e = f = g = h = i =

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Part 1: -9; Part 2: 7; Part 3: 12; Part 4: -5; Part 5: 4; Part 6: 7; Part 7: 3; Part 8: -2; Part 9: -4

Question 4

Select the matrix that is the inverse of:

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Answer image: https://r20.core.learn.edgenuity.com//media.edgenuity.com/EVresources/3111-06-54-20-06-task/mc001-4.jpg

Question 5

Use your knowledge of inverses and matrix multiplication to answer the following:AB =

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I

Question 6

Internet sites often ask for a secret phrase to recover lost passwords. Jason encoded a secret phrase using matrix multiplication. He multiplied the clear text code for each letter by the matrix: The matrix representing the encoded text is:Jason’s secret phrase is:

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CATS RULE DOGS DROOL

Question 7

ABA =

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A

Question 8

BBA =

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B

Question 9

BBAA =

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I

Matrices and Their Inverses Answers

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