4
-14<0⇒x²+2x-15>0
x1+x2=-2 U x1*x2=-15⇒x1=-5 U x2=3
+ _ +
-------------------(-5)-------------(3)------------------
x∈(-∞;-5) U (3;∞)
5
-10<0⇒(x-3)²-5<0<br>(x-3-√5)(x-3+√5)<0<br>x=3+√5 x=3-√5
+ _ +
-------------------(3-√5)-------------(3+√5)------------------
x∈(3-√5;3+√5)
6
x(2x-3)>0
x=0 x=1,5
+ _ +
-------------------(0)-------------(1,5)------------------
x∈(-∞;0) U (1,5;∞)