Răspuns :
(2x-1)(2x+1)+(x+rad4)^2=(4x^2-1)+(x^2+4x+4)=4x^2-1+x^2+4x+4=5x^2+4x+3
Am folsit:
Rad4=2
(a+b)(a-b)=a^2-b^2
(a+b)^2=a^2+2ab+b^2
Am folsit:
Rad4=2
(a+b)(a-b)=a^2-b^2
(a+b)^2=a^2+2ab+b^2