Question

(√28-2√3+√7)*√7+√84

Answer 1

\(\left(2\sqrt{7}-2\sqrt{3}+\sqrt{7}\right)\sqrt{7}+2\sqrt{21}\)

\(14-2\sqrt{21}+7+2\sqrt{21}\)

\(21\)

Answer 2

\(=3\sqrt{7}\cdot\sqrt{7}-2\sqrt{3}\cdot\sqrt{7}+2\sqrt{21}\)

=21