Question

(2√5-√14)(2√5+√14) помогите решить

Answer 1

Ответ:

$4 \times 5 - 14 = 20 - 14 = 6$

Answer 2

$\displaystyle \tt (2\sqrt{5}-\sqrt{14})(2\sqrt{5}+\sqrt{14})=(2\sqrt{5})^{2}-(\sqrt{14})^{2}=4\cdot5-14=6;$