14 si 15 subpunctul b va rog frumos!

14) b) [tex]\frac{25x^{2} }{5x^{2}+5x } = \frac{25x^{2} }{5(x^{2}+x) } = \frac{5x^{2} }{x^{2}+x }[/tex]
15) b) [tex]\frac{(x-3)^2}{x^{2}-7x+12 } = \frac{(x-3)^2}{x^{2}-4x-3x+12} = \frac{(x-3)^2}{x(x-4)-3(x-4)} =\frac{(x-3)^2}{(x-4)(x-3)} = \frac{x-3}{x-4}[/tex]