Question

Calculati,utilizand formulele de calcul prescurtat.

(1+a)²+(2a)²+(3a)²=

Answer 1

1+2a+a²+4a²+9a²=14a²+2a+1

Answer 2

$(1+a)^2+(2a)^2+(3a)^2=\ \textgreater \ 1+2a+a^2+4a^2+9a^2$$=\ \textgreater \ 1+2a+14a^2$
Conform formulei :
$(a+b)^2=a^2+2ab+b^2$
$Succes.$