128=64×2=82\sqrt{128} = \sqrt{64 \times 2} = 8\sqrt{2}128=64×2=82
32=16×2=42\sqrt{32} = \sqrt{16 \times 2} = 4\sqrt{2}32=16×2=42
Simplifying, we have 8242−22= 8222\;\frac{8\sqrt{2}}{4\sqrt{2} - 2\sqrt{2}} = \;\frac{8\sqrt{2}}{2\sqrt{2}}42−2282=2282
= 4
