Question
If $\alpha$ and $\beta$ are the roots of $x^2 - ax + b^2 = 0$, and $a^2 + b^2 = 0$, then $a^2 + b^2$ is equal to ---------
If $\alpha$ and $\beta$ are the roots of $x^2 - ax + b^2 = 0$, and $a^2 + b^2 = 0$, then $a^2 + b^2$ is equal to ---------