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nessaty13
05.10.2020 •
Mathematics
Three times the sum of
4 and t is the same as the
difference of t and 2
Solved
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Ответ:
3(4 + t) = t - 2
Step-by-step explanation:
Symbolically, we have:
3(4 + t) = t - 2
Ответ:
You can proceed as follows:
Step-by-step explanation:
Suppose that the matrix
is invertible, and suppose that at least one of the matrices
is not invertible. Without loss of generality suppose that the matrix
is not invertible. Remember the important result that a matrix is invertible if and only if its determinant is nonzero. Then,
On the other hand, the determinant of a products of matrices is the product of the determinants of the matrices, that is to say,
But we supposed that
is not invertible. Then
. Then
. This contradicts the fact that
and then the three matrices
must be invertible matrices.