Question

Упростите выражение (√7 + √2) степени 2 - 2√14

Answer 1

$(sqrt{7}+sqrt{2})^2-2sqrt{14}=\\=(sqrt{7})^2+2sqrt{7}sqrt{2}+(sqrt{2})^2-2sqrt{14}=7+2sqrt{14}+2-2sqrt{14}=9$