A = {x : x2 - 4x - 5 = 0}
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Step-by-step explanation:
Firstly factorize x²-4x-5=0
x² + x - 5x - 5 = 0
x(x+1) - 5(x +1) =0
(x +1)(x -5) = 0
(x +1)=0 or (x -5) = 0
x = -1 x =5
therefore A = {-1 , 5}
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