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anonymous
 one year ago
What is the determinant of
https://lincolnlearningsolutions.brainhoney.com/Resource/19809088,B84/Assets/assessmentimages/alg%202%20pt%202%20u3l5%2019.jpg
anonymous
 one year ago
What is the determinant of https://lincolnlearningsolutions.brainhoney.com/Resource/19809088,B84/Assets/assessmentimages/alg%202%20pt%202%20u3l5%2019.jpg

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Michele_Laino
 one year ago
Best ResponseYou've already chosen the best response.3developing the determinant along the first row of your matrix, we have: \[ \det A = 1 \times \det \left( {\begin{array}{*{20}{c}} {  5}&{  7} \\ {  5}&{  7} \end{array}} \right)  \det \left( {\begin{array}{*{20}{c}} {  6}&4 \\ {  5}&{  7} \end{array}} \right)  8\det \left( {\begin{array}{*{20}{c}} {  6}&4 \\ {  5}&{  7} \end{array}} \right)\]

Michele_Laino
 one year ago
Best ResponseYou've already chosen the best response.3now we have: \[\det \left( {\begin{array}{*{20}{c}} {  5}&{  7} \\ {  5}&{  7} \end{array}} \right) = 0,\;\det \left( {\begin{array}{*{20}{c}} {  6}&4 \\ {  5}&{  7} \end{array}} \right) = 42 + 20 = 62,\]

Michele_Laino
 one year ago
Best ResponseYou've already chosen the best response.3what do you get?

Michele_Laino
 one year ago
Best ResponseYou've already chosen the best response.3Hint: the determinat of a matrix with real coefficients, has to be a real number

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0okay i just got confused

Michele_Laino
 one year ago
Best ResponseYou've already chosen the best response.3hint: \[\begin{gathered} \det A = 1 \times \det \left( {\begin{array}{*{20}{c}} {  5}&{  7} \\ {  5}&{  7} \end{array}} \right)  \det \left( {\begin{array}{*{20}{c}} {  6}&4 \\ {  5}&{  7} \end{array}} \right)  8\det \left( {\begin{array}{*{20}{c}} {  6}&4 \\ {  5}&{  7} \end{array}} \right) = \hfill \\ \hfill \\ = 0  62  8 \times 62 = ...? \hfill \\ \end{gathered} \]

Michele_Laino
 one year ago
Best ResponseYou've already chosen the best response.3sorry, I developed the determinant along the first column of your matrix, not along the first row

Michele_Laino
 one year ago
Best ResponseYou've already chosen the best response.3what is: \[\Large  62  \left( {8 \times 62} \right) = ...?\]

Michele_Laino
 one year ago
Best ResponseYou've already chosen the best response.3that's right! we have det(A)= 558, where A is your matrix
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