If the n x n matrices A and B are symmetric and B is in- vertible, which of the matrices in Exercises 13 through 20 must be symmetric as well? 13. ЗА 14. -B 15. АВ 16. A+B 17. В -1 18. А10 19. 21, + ЗА —4A2 20. АВ?А

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Please answer #14

If the n x n matrices A and B are symmetric and B is in-
vertible, which of the matrices in Exercises 13 through 20
must he symmetric as well?
13. ЗА
14. -B
15. AB
16. А + B
17. В -1
18. A10
19. 21, + ЗА - 4A?
20. АВ?А
Transcribed Image Text:If the n x n matrices A and B are symmetric and B is in- vertible, which of the matrices in Exercises 13 through 20 must he symmetric as well? 13. ЗА 14. -B 15. AB 16. А + B 17. В -1 18. A10 19. 21, + ЗА - 4A? 20. АВ?А
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