Question

Dezvoltă folosind formula
(x+$\sqrt{2}$)²=

Answer 1

Ai formula (a+b)^2=a^2+2ab+b^2.
(de unde vine formula? e simplu: (a+b)^2=(a+b)(a+b)=a*a+a*b+b*a+b*b=a^2+ab+ba+b^2=a^2+2ab+b^2)


Inlocuiesti a=x si b=rad(2). Obtii astfel (x+rad(2))^2=x^2+2*x*rad(2)+(rad(2))^2= x^2+2rad(2)x+2.