Question 1168228
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Word-in-word and number-in-number, this problem was solved many years ago under this link


<A HREF=https://www.algebra.com/algebra/homework/Matrices-and-determiminant/Matrices-and-determiminant.faq.question.687733.html>https://www.algebra.com/algebra/homework/Matrices-and-determiminant/Matrices-and-determiminant.faq.question.687733.html</A>


https://www.algebra.com/algebra/homework/Matrices-and-determiminant/Matrices-and-determiminant.faq.question.687733.html



Another solution for a TWIN problem is under this link


<A HREF=https://www.algebra.com/algebra/homework/Matrices-and-determiminant/Matrices-and-determiminant.faq.question.1155274.html>https://www.algebra.com/algebra/homework/Matrices-and-determiminant/Matrices-and-determiminant.faq.question.1155274.html</A>


https://www.algebra.com/algebra/homework/Matrices-and-determiminant/Matrices-and-determiminant.faq.question.1155274.html




Never say &nbsp;" guass " &nbsp;method.


By doing so, &nbsp;you insult the memory of the great mathematician Carl Friedrich Gauss 

and demonstrate total absence knowledge on the subject.