If [x2]+x−a=0 has a solution ( [.] represents the greatest integer function), where a∈N, a≤20, then the total number of distinct values of a is

If [x2]+x−a=0 has a solution ( [.] represents the greatest integer f

1.	If [x2]+x−a=0 has a solution ( [.] represents the greatest integer function), where a∈N, a≤20, then the total number of distinct values of a is
Answer» If $[x^{2}] + x - a = 0$ has a solution $([.]$ represents the greatest integer function $)$ , where $a \in N, a \leq 20$ , then the total number of distinct values of $a$ is