x^2-12x-45<0
x1=15 x2=-3
(-3;15)
2) 0<25x^2<36
0<x^2<36/25
(-6/5;6/5)
3) 4x^2-9<0
x^2<9/4
(-1,5;1;5)
x^2-12x-45<0
x1=15 x2=-3
(-3;15)
2) 0<25x^2<36
0<x^2<36/25
(-6/5;6/5)
3) 4x^2-9<0
x^2<9/4
(-1,5;1;5)