\(\sqrt{17-3\sqrt{32}}-\sqrt{17+3\sqrt{32}}=\frac{\sqrt{2}\sqrt{17-3\sqrt{32}}-\sqrt{2}\sqrt{17+3\sqrt{32}}}{\sqrt{2}}\)
\(=\frac{\sqrt{34-2.3\sqrt{32}}-\sqrt{34+2.3\sqrt{32}}}{\sqrt{2}}\)
\(=\frac{\sqrt{\left(3\sqrt{2}\right)^2-2.3\sqrt{2}.4+4^2}-\sqrt{\left(3\sqrt{2}\right)^2+2.3\sqrt{2}.4+4^2}}{\sqrt{2}}\)
\(=\frac{3\sqrt{2}-4-3\sqrt{2}-4}{\sqrt{2}}=\frac{-8}{\sqrt{2}}=-4\sqrt{2}\)