Question

A = {x : x2 - 4x - 5 = 0}​

Answer 1

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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