Question 79
Find all $x$ satisfying the equality
$$
[x^2] - [-x^2] - 8[x] + 2 = 0.
$$
(Here $[x]$ stands for the greatest integer not exceeding $x$.)
$$
[x^2] - [-x^2] - 8[x] + 2 = 0.
$$
(Here $[x]$ stands for the greatest integer not exceeding $x$.)