Write the following set in roster (Tabular) form :
A2 = {x : x2 - 4x - 5 = 0 }
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⇒ x2 - 5x + x - 5 = 0
⇒ x (x - 5) + 1(x - 5) = 0
⇒ (x - 5) (x + 1) = 0
⇒ (x - 5) = 0 or (x + 1) = 0
⇒ x = 5 or x = -1
A2 = {5, -1}
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A1 = {x : 2x + 3 = 11}
A3 = {x : x ∈ Z, -3 ≤ x < 4}
A4 = {x : x is a two digit number and sum of the digits of x is 7 }