1. For which $x$ does the inequality $\frac{(x-y)^{2}(x+2 y)}{x+y+1} \geq 0$ hold for all solutions $y$ of the equation $4 \sqrt{y}=y+3$?
Task 1. Answer: $x \in(-\infty ;-18] \cup(-10 ;-2) \cup(-2 ;+\infty)$