How do you simplify rational expression (x^2 - 1)/(x^2 - 2x - 3) ?

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blakebranham5

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I need help learning how to solve questions so I will have an idea of how they are done.

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Do you know how to factorise the difference of two squares (in the numerator)?
Do you know how to factorise a trinomial (in the denominator)?
 
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