упростите :3 √28(√14-√7)-2√98

Question

упростите :3 √28(√14-√7)-2√98

Answer 1

√28(√14-√7)-2√98=√4*√7(√7*√2-√7)-2*√2*√49=√2²*√7*√7(√2-1)-2*√2*√7²=2*√7²(√2-1)-2*7*√2=2*7*(√2-1)-14√2=14√2-14-14√2=-14