Question 22If $a\pm bi$ $(b\ne0)$ are imaginary roots of the equation $x^3+qx+r=0,$ where $a,$ $b,$ $q,$ and $r$ are real numbers, then $q$ in terms of $a$ and $b$ is:$a^2+b^2$$2a^2-b^2$$b^2-a^2$$b^2-2a^2$$b^2-3a^2$