Б) 15-6(3х-1)>0,5(4х-2)
1/3(2х+1)<х
2х+1/7-3х-1/14>0 /*14
15-18х+6>2х-1
2/3х+1/3<х /*3
4х+2-3х+1>0
-20х>-22
2х+1<3х
х>-3
х<22/20
-х<-1
х>-3
х>11/10
х>1
х>-3
Ответ: (-3;+беск)
Y=x2-2
•__________•_________•
2х² + 8х - х - 4 = 2х + 8
2х² + 5х - 12 = 0
D = b² - 4ac = 25 -4·2·(-12) = 121
x1 = (-5 + 11)/4 = 6/4 = 1,5
х2 = (-5 - 11)/4 = -16/4 = -4