What is x, if P = ( begin{bmatrix}1&4 2&x end{bmatrix} ) is a singular matrix?

What is x, if P = ( begin{bmatrix}1&4 2&x end{bmatrix} ) is a singul

1.	What is x, if P = ( begin{bmatrix}1&4 2&x end{bmatrix} ) is a singular matrix?
A.	5
B.	6
C.	7
D.	8
Answer» E.