21.1. $$(\sqrt{19}-7)^2 + 14\sqrt{19} = (19 - 14\sqrt{19} + 49) + 14\sqrt{19} = 19 + 49 = 68$$.
21.2. $$(\sqrt{11}-7)^2 + 14\sqrt{11} = (11 - 14\sqrt{11} + 49) + 14\sqrt{11} = 11 + 49 = 60$$.
21.3. $$(\sqrt{15}-2)^2 + 4\sqrt{15} = (15 - 4\sqrt{15} + 4) + 4\sqrt{15} = 15 + 4 = 19$$.
21.4. $$(\sqrt{17}-6)^2 + 12\sqrt{17} = (17 - 12\sqrt{17} + 36) + 12\sqrt{17} = 17 + 36 = 53$$.
21.5. $$(\sqrt{13}-3)^2 + 6\sqrt{13} = (13 - 6\sqrt{13} + 9) + 6\sqrt{13} = 13 + 9 = 22$$.