Irian bought 2 songbooks and a new guitar. Each songbook cost the same price. The guitar cost $250.10. Before tax, she spent a t
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Answer:
-136
Step-by-step explanation:
We have to find the determinant of the following matrix:
We can find the determinant by expanding via 1st column. i.e. by taking each element of 1st column and multiplying it by its co-factor matrix as shown below:
det
=
The notation det() stands for determinant of the matrix.
Therefore, the determinant of the given matrix is -136