4x^2-49<0<br>4x^2<49<br>4x<7 |:4<br>x <7/4<br>-------------
16x^2-8x+1>0
16x^2-8x+1=0
D = 64-16*1*4= 0
x = 8/32 = 1/4
(x-1/4)(x-1/4)>0
1/4
- +
---------------------------------------
(1/4; +infinity)
----------------------------------------
0.6x^2<-18x<br>0.6x^2+18x<0<br>x(0.6x+18x)<0<br> 0
- +
-------------------------------------
(-ifinity; 0)
------------------------
x^2<=16<br>x<=4<br>(-ifinity; 4]