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Matrix operations - part 7
Find the determinant of the matrix: \begin{bmatrix} 4 &-9 \\ 2& 7 \end{bmatrix}

Correct Answer

Incorrect Answer

How to get the right answer:

\begin{bmatrix} 4 &-9 \\ 2& 7 \end{bmatrix} = 4 X 7 - 2 X -9 = 24 - (-18) = 24 + 18 =  42