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We will solve this by factoring

x^2 -4x -5 =0

We can rewrite above equation as

x^2 - 5x + x -5 =0

taking x as common factor from first two

x( x -5 ) + 1 ( x-5 ) =0

Taking (x-5) as common factor

(x-5 ) (x+1) =0

So either x-5 =0 or x =5

x+1 =0

x =-1

Hope this helps

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