Evaluate ( begin{vmatrix}2&5 -1&-1 end{vmatrix} ).

1.	Evaluate ( begin{vmatrix}2&5 -1&-1 end{vmatrix} ).
A.	3
B.	-7
C.	5
D.	-2
Answer» B. -7

Discussion

Find the value of x if ( begin{vmatrix}3&x 2&x^2 end{vmatrix} )= ( begin{vmatrix}5&3 3&2 end{vmatrix} ).
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Evaluate ( begin{vmatrix}2&5 -1&-1 end{vmatrix} ).