Question

Выполнить действия (5√7-√63+√14)×√7

Answer 1

$(5 sqrt{7}- sqrt{7*9}+ sqrt{2*7})* sqrt{7}=5*7-3*7+ sqrt{2}*7=14+7 sqrt{2}$

Answer 2

5√7*√7-√63*√7+√14*√7=5*7-√441+√98=35-21+7√2=14+7√2=7√2(√2+1)