If the set a = {x | X & # 178; + 3x-4 & lt; 0, X ∈ r}, then what is the number of proper subsets of the set a ∩ Z,

If the set a = {x | X & # 178; + 3x-4 & lt; 0, X ∈ r}, then what is the number of proper subsets of the set a ∩ Z,

x²+3x-4