[tex] \frac{ab {}^{2} }{ab} = b[/tex]
[tex] \frac{x² + 3x - 4}{x² - 1} \\ \times ² - \times + 4 \times - 4 \\ ( \times ² - \times ) + (4 \times - 4) \\ \times ( \times - 1) + 4( \times - 1) \\ ( \times - 1)( \times + 4)( \times ² - 1 \\ = \frac{ \times + 4}{ \times + 1} [/tex]
[tex] \frac{x² - 9}{x + 3} \\ a² - b² = (a + b)(a - b) \\ \frac{( \times + 3)( \times - 3)}{(times + 3)} \\ = \times - 3[/tex]
[tex] \frac{x² - 4}{x³ - 8} \\ \frac{ ( \times + 2)( \times - 2)}{ \times ³ - 8} \\ \frac{ (\times + 2)( \times - 2)}{( \times - 2)( { \times² + \times \times 2 + 2 ²) \\ = \frac{ \times + 2}{ \times ² + 4} [/tex]
[tex] \frac{2x² + x}{2x³ + 7x²3x} \\ \times \frac{ \times (2 + \times + 1}{ \times (2 \times ² + 7 \times + 3)} \\ \frac{2 \times + 1}{2 \times 2² + 7 \times + 3} \\ \frac{2 \times + 1}{(2 \times + 1)( \times + 3)} = \frac{1}{ \times + 3} [/tex]
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