Determine the set of xxx satisfying ⌊x⌋2−2⌊x⌋−3≤0\lfloor x \rfloor^2 - 2\lfloor x \rfloor - 3 \leq 0⌊x⌋2−2⌊x⌋−3≤0.
−1≤x<4-1 \leq x < 4−1≤x<4
x∈{−1,0,1,2,3}x \in \{-1, 0, 1, 2, 3\}x∈{−1,0,1,2,3}
−1≤x<5-1 \leq x < 5−1≤x<5
0≤x<30 \leq x < 30≤x<3