Question

aduceti la forma cea mai simpla este urgent 
$( \sqrt{2\sqrt{5}}+4- \sqrt{2 \sqrt{5}}-4) ^{2}$

Answer 1

[√(2√5+4)-√(2√5-4)]²=
=(2√5+4) - 2√(2√5+4)(2√5-4) +(2√5-4)=
=2√5+4 - 2√(20-16) +2√5-4=
=4√5 - 2√4 =
=4√5 - 4 =
=4(√5-1)