Question

va rog mult sa ma ajutati :(

Answer 1

(a+b) ^2=a^2+2ab+b^2
3-rad5+2*(9-5)+3+rad5=
6+2*414
=

Answer 2

$S={ (\sqrt{3- \sqrt{5} }+ \sqrt{3+ \sqrt{5} })}^2=3- \sqrt{5}+2 \sqrt{(3-\sqrt{5})(3+\sqrt{5})} +3+ \sqrt{5}=$$=2 \sqrt{ 3^{2}-5 }=2 \sqrt{4}=4$