Solution
= Solution
Solvability requires $b$ to be orthogonal to the left nullspace. For $a=-2$ one may take $n=(-3,-2,2)^T$; for $a=3$ one may take $n=(1,-1,1)^T$.
= Solution
Solvability requires $b$ to be orthogonal to the left nullspace. For $a=-2$ one may take $n=(-3,-2,2)^T$; for $a=3$ one may take $n=(1,-1,1)^T$.