Răspuns :
[tex]\it f(\sqrt2) = -2\sqrt2+3=3-2\sqrt2\\ \\ f(-\sqrt2)=-2(-\sqrt2)+3= 3+2\sqrt2\\ \\ m_g=\sqrt{(3-2\sqrt2)(3+2\sqrt2)}=\sqrt{3^2-(2\sqrt2)^2}=\sqrt{9-8}=\sqrt1=1[/tex]
[tex]\it f(\sqrt2) = -2\sqrt2+3=3-2\sqrt2\\ \\ f(-\sqrt2)=-2(-\sqrt2)+3= 3+2\sqrt2\\ \\ m_g=\sqrt{(3-2\sqrt2)(3+2\sqrt2)}=\sqrt{3^2-(2\sqrt2)^2}=\sqrt{9-8}=\sqrt1=1[/tex]