Question

(3-sqrt2)(5+sqrt2) - (sqrt2 - 1)^2 (полное решение)

Answer 1

$tt(3-sqrt{2})(5+sqrt{2})-(sqrt{2}-1)^2=\\=15+3sqrt{2}-5sqrt{2}-2-(2-2sqrt{2}+1)=\\=13-2sqrt{2}-2+2sqrt{2}-1=10$