September 29th, 2018, 06:46 PM  #1 
Senior Member Joined: Apr 2017 From: New York Posts: 155 Thanks: 6  matrix elimination
What do you guys suggest to solve this question,please?

September 29th, 2018, 07:47 PM  #2 
Senior Member Joined: Sep 2015 From: USA Posts: 2,458 Thanks: 1338 
if elimination fails then the matrix has no inverse and thus it's determinant is 0. solve the resulting quadratic for it's two roots 
September 29th, 2018, 07:54 PM  #3 
Math Team Joined: Dec 2013 From: Colombia Posts: 7,663 Thanks: 2642 Math Focus: Mainly analysis and algebra 
By inspection (using Romsek's idea) I'd say that zero and 3 are the numbers you are looking for.

September 29th, 2018, 09:29 PM  #4 
Senior Member Joined: Apr 2017 From: New York Posts: 155 Thanks: 6 
ok now I totally understand how to solve it. thanks 

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elimination, matrix 
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