Răspuns :
[tex]...=2x^2+2x\sqrt2+1-2x^2+1-2x\sqrt2=2[/tex]
Am folosit formulele:
[tex](a+b)^2=a^2+2ab+b^2\ \ si \ \ (a-b)(a+b)=a^2-b^2[/tex]
Am folosit formulele:
[tex](a+b)^2=a^2+2ab+b^2\ \ si \ \ (a-b)(a+b)=a^2-b^2[/tex]
2x patrat + 2xradical din 2 + 1 - 2x patrat + 1 -- 2x radical din 2 =2