Răspuns :
[tex](2\sqrt{3}-3)(2\sqrt{3}+3) =\\ =\left(2\sqrt{3}\right)^2 - 3^2\\ =4\cdot 3-9\\ =12-9\\ = 3\\ \\ \textbf{Formul\u{a} de calcul prescurtat:}\\ (a-b)(a+b) = a^2-b^2[/tex]
[tex](2\sqrt{3}-3)(2\sqrt{3}+3) =\\ =\left(2\sqrt{3}\right)^2 - 3^2\\ =4\cdot 3-9\\ =12-9\\ = 3\\ \\ \textbf{Formul\u{a} de calcul prescurtat:}\\ (a-b)(a+b) = a^2-b^2[/tex]