Isn't this wrong? This worksheet
This question:
$$w^2 - w \leq 0$$
This answer:
$$(-\infty, -1] \cup [0, 1]$$
Isn't this wrong ? At $w = -2$, it becomes: $(-2)^2 - (-2)$, which is $4 + 2$, which is $\geq 0$. But might be that I must be wrong somewhere. Please correct me. Thanks.

$w^2-w\le 0$
$w(w-1)\le 0$
$0\le w\le 1$
The answer given is wrong.
