We shall start with finding the determinant of a 2 by 2 matrix. Find \[det \left( \begin{array}{ccc}2 & 5 \\1 & 4 \\\end{array} \right)\].

In the case that you do not know '\(det\)', it actually is a very important function in matrices. It helps in finding the inverses of matrices and the increase of size after a transformation matrix has been applied on an area.

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