Question

(√7-√5)²=
va rog ajutorr

Answer 1

$(a-b)^{2}= a^{2}-2ab+ b^{2} \\ ( \sqrt{7}- \sqrt{5} )^2= (\sqrt{7}) ^2-2 \sqrt{7} \sqrt{5}+ (\sqrt{5})^{2}= \\ =7-2 \sqrt{35}+5= \\ =12-2 \sqrt{35} .$