1)7x2-5x-2>0
14-5x-2>0
12-5x>0
-5x>-12
x<12<br> ---
5
2)2x2-x>-3
4-x>-3
-x>-3-4
-x>-7
x<7<br>3)1>-36x2-12x
1>-72-12x
12x>-72-1
12x>-73
x>-73
---
12
4)(x+4)x2+(x+3)x2<(x+5)x2<br>2x+8+2x+6<2x+10<br>8+2x+6<10<br>14+2x<10<br>2x<10-14<br>2x<-4<br>x<-2<br>