Răspuns:
[tex]a. \: \: \frac{ { \times }^{2} - 4 }{ {( \times + 2})^{2} } = \frac{( \times - 2)( \times + 2)}{( { \times + 2 }^{} ) {}^{2} } = \frac{ (\times - 2)}{( \times + 2)} [/tex]
[tex]b. \: \: \frac{( \times - 3)( \times + 3)}{ { \times }^{2} - 6 \times + 9} = \frac{( \times - 3)( \times + 3)}{ {( \times - 3)}^{ 2} } = \frac{( \times + 3)}{( \times - 3)} [/tex]
