Răspuns:
Explicație pas cu pas:
9
[tex]\frac{(x+2)(x+2)}{(x+2)(x-2)} =\frac{x+2}{x-2}[/tex]
[tex]\frac{3x(x^{2} +2x+1)}{7x(x^{2} -1)} =\frac{)3(x+1)(x+1)}{7(x+1)(x-1)} =\frac{3(x+1)}{7(x-1)}[/tex]
11
[tex]\frac{x+4)(x-4)}{(x-5)(x-4)} =\frac{x+4}{x-5}[/tex]
[tex]\frac{(x+4)(x+4)}{(x+4)(x+5)} =\frac{x+4}{x+5}[/tex]
Formule folosite
a²+2ab+b² = (a+b)²
a²-2ab+b² = (a-b)²
a²-b² = (a+b)(a-b)
