Question

Number of elements in the set {$x$ : $xϵZ$ and $x^2\le 4$} are :

Answer 1

Given, {$x$ : $xϵZ$ and $x^2\le 4$}

Values of $x$, which is an integer satisfying the given condition $x^2\le 4$ are $-2,-1,0,1,2$.
Thus, the elements of the set are $-2,-1,0,1,2$.

Hence, the number of elements in the set is $5$.