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OpenStudy (anonymous):
let A be a 3 X 3 matrix with determinant 11. Find det(adj(6A) ) Isn't the answer (6A)^2?
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OpenStudy (anonymous):
@thomaster
OpenStudy (anonymous):
@amistre64 help!
OpenStudy (amistre64):
adjoint(6A) eh ....
OpenStudy (amistre64):
im sure there are thrms that help in this that i have forgotten along time ago
OpenStudy (amistre64):
an adjoint is the transpose of a cofactor matrix ... not that that helps out any
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OpenStudy (watchmath):
Use te fact that for n by n matrix A we have \(\det(adj A)=(\det A)^{n-1}\)
OpenStudy (amistre64):
yeah, that does sound more useful :)
OpenStudy (anonymous):
do i sub 6A for A? |dw:1381687412479:dw|
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