General Knowledge Economy

The quadratic form ax2 + by2 + 2hxy is negative for all values of x and y (other than x = y = 0) if and only if:

1

a > 0 and |h| < |b|

2

a < 0 and |h| < |b|

3

a < 0 and |h| > |b|

4

a < 0 and |h| ≠ |b|

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