Răspuns :
[tex]16(x+1)^2-9(x+3)^2= \\ 4^2(x+1)^2-3^2(x+3)^2= \\ \[[4(x+1)]^2-\[[3(x+3)]^2= \\ \[[4(x+1)-3(x+3)][4(x+1)+3(x+3)][/tex]
Formule folosite:
[tex]a^m\cdot b^m=(a\cdot b)^m \\ a^2-b^2=(a+b)(a-b)[/tex]
Formule folosite:
[tex]a^m\cdot b^m=(a\cdot b)^m \\ a^2-b^2=(a+b)(a-b)[/tex]