Question

упростите выражение
$sqrt{28} ( sqrt{14} - sqrt{7} )-2 sqrt{98}$

Answer 1

√28*14-√28*7-2√98=√392-√196-2√98=√8*49-√4*49-2√2*49=2*7√2-2*7-2*7√2=14√2-14-14√2=-14