(a+2)²+(a+1)² Va rog!!!!Urgent!!!!!!

Răspuns :


(a+2)²+(a+1)²=

(a+2)²=a²+2·a·2+2²=a²+4a+4

(a+1)²=a²+2·a·1+1²=a²+2a+1

a²+4a+4+a²+2a+1=2a²+6a+5