Question

Решите неравенства.

1) (x - 2) (x + 4) > 0

2) (x - 11) (x - 3) < 0

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

4) (x + 7) (x + 1) > 0

Answer 1

Ответ:

1)

х>2

х>-4

-(+)--(-4)----(-)----2----(+)

(-∞;-4)u(2;∞+)

2)

x<11

x<3

--(-)--3---------(+)--------11--(-)----

(3;11)

3)

x<3

x<-5

---(-)--(-5)-----(+)---------3-(-)-----

(-5;3)

4)

x>-7

x>-1

----(+)--(-7)------(-)--------(-1)----(+)--

(-∞;-7)u(-1;∞+)