Question

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Answer 1

Answer:

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Step-by-step explanation:

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Answer 2

Step-by-step explanation:

$\tt\frac{ {x}^{2} - 9}{ {x}^{2} + 7 {x} + 12 } \\ \\ \tt\frac{ {x}^{2} - {3}^{2} }{ {x}^{2} + 4 {x} + 3 {x} + 12 } \\ \\ \tt\frac{ (x + 3)(x - 3)}{ {x}^{} (x + 4) + 3( {x}^{} +4)} \\ \\ \tt \frac{ \cancel{(x + 3)}(x - 3)}{(x + 4) \cancel{(x + 3)} } \\ \\ \frac{x - 3}{x + 4}$