Let $S$ be solutions of a system of quadratic polynomials on $\mathbb{R}^n$.

Suppose $q$ is another quadratic polynomial such that $q|_S\geqslant 0$.

>Is it possible to find a polynomial $\tilde q$ such that  $\tilde q\geqslant0$, $\deg \tilde q\leqslant 2$, and $\tilde q\ |_S=q|_S$?

**Comments**

- If the system contains only one polynomial, then the answer is yes.