Discontinuity Points Piecewise Function

The number of points where the function
f(x)={

|2x2−3x−7|	‌ if ‌	x≤−1
[4x2−1]	‌ if ‌	−1<x<1
|x+1|+|x−2|	‌ if ‌	x≥1.

[t] denotes the greatest integer ≤t , is discontinuous is