Відповідь:

Пояснення:

1) x<0

(x-0) (x-10) < 0

x^2-10x<0

x(x-10)<0

x = 0 => x = 0 and 10

(0;10)

2) x<0

(x+6)(x-6)<=0

x^2-6x+6x-36<=0

x^2-36<=0

x^2<= 36

-6<=x<=6

[-6;6]

3) x<0

(x+3)(x-5)<0

x^2-2x-15<0

x = 0 => x = 5 and -3

(-3;5)

4) x <= 0

(x-1)(x-8)<=0

x^2-9x+8<=0

x = 0 => x = 8 and 1

[1;8]