Question

\(\left(\sqrt{2}+1\right)^2+\left(\sqrt{2}-1\right)^2\)
Giải giúp mình ạ

Answer 1

\(\left(\sqrt{2}+1\right)^2+\left(\sqrt{2}-1\right)^2\)

\(=3+2\sqrt{2}+3-2\sqrt{2}\)

=6

Answer 2

\(=\sqrt{2}+1+\sqrt{2}-1=2\sqrt{2}\)