The condition for which the eigenvalues of the matrix A

The condition for which the eigenvalues of the
matrix A = 2 1 are positive, is
1 K

All eigen values of A =		2		1		are position 2 > 0
		1		k

∴ 2 × 2 leading minor will be greater then zero.

		2		1		> 0
		1		k

2 k –1 > 0
2 K > 1

k >	1	.
	2