Question

$1. \frac{1}{ {x}^{2} - 1 } + \frac{2}{x + 1} \\ \\ 2.( \frac{ {x }^{2} + 4x - 21}{ {x}^{2} - 6x + 9} )( \frac{ {x}^{2} - 16}{ {x }^{2} + 3x - 28 } ) \\ \\ 3. ( \frac{ {x}^{2} - 1}{ {x }^{2} + 4x + 4 } ) \div ( \frac{ {x}^{2} + 8x + 7}{2x + 4} )$
help me please​

Answer 1

Step-by-step explanation:

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