(х+5)(х+5)-16 меньше либо равно 0
(х+5)(х+5)-16 <= 0
x^2+10x+25-16<=0
x^2+10x+9<=0
x1=-1
x2=-9
(x+1)(x+9)<=0
+ - +
--------|------------------|-------------->
-9 -1
xЄ[-9;-1]