GRE Exam Numerical Ability Quadratic Equations

Which of the following is a common factor of both equations x² – 4x – 5 and x² – 6x – 7 ?

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(x+1) is the common factor for both the quadratic equations:-
x² – 4x – 5 = (x-5)(x+1) & x² – 6x – 7 = (x-7)(x+1)
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