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The quadratic form qA(x,y)=x2+2xy+3y2 is positive-semidefinite but not positive definite negati ...
The quadratic form qA?(x,y)=x2+2xy+3y2 is positive-semidefinite but not positive definite negative-semidefinite but not negative definite indefinite negative definite positive definite
![The quadratic form
\[
q_{A}(x, y)=x^{2}+2 x y+3 y^{2}
\]
is
positive-semidefinite but not positive definite
negative-semidefi](https://media.cheggcdn.com/media/387/387bb4b5-4b6a-4942-b488-55ee661be890/phpTYO45q)