How to solve for $t$: $\|X + Vt + At^2\| = r$
$\|x\|$ is vector norm.
I would prefer explanation of how to get to exact solutions, I know definitions, it's more of an algebraic difficulty for me.
Equation in other form: $\sum (a_it^2 + v_it + x_i)^2 = r^2$