(2x+1)la puterea 2 -9=?

Răspuns :

(2x+1)²-3²=(2x+1-3)(2x+1+3)=(2x-2) (2x+4)=2(x-1)*2(x+2)=4(x-1)(x+2)
sau 4(x²+x-2)
[tex](2x+1)^2-9=(2x+1)^2-3^2=(2x+1+3)(2x+1-3)= \\ (2x+4)(2x-2)[/tex]