Find the determinant of the matrix. Expand by cofactors on the row or column that appears to make the computations easiest.
−1 0 0
11 −1 4
1 0 5
the entire problem is in brackets
−1 0 0
11 −1 4
1 0 5
the entire problem is in brackets
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-1 (-5-0) = -1(-5) = 5
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I guess you haven't opened your textbook this term yet!
http://www.analyzemath.com/Tutorial-Syst…
http://www.analyzemath.com/Tutorial-Syst…
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5