1) 2-5х=14-5х = 12х = -12/5 or х = -2.4
2) 9 + 4х2 - 12х = 04х2 - 12х + 9 = 0(2х - 3)2 = 02х - 3 = 0х = 3/2 or х = 1.5
3) 2х2 - 9х - 5 = 0(2х + 1)(х - 5) = 02х + 1 = 0 or х - 5 = 0х = -1/2 or х = 5
4) 4х2 = 9 = 16х4х2 - 16х - 9 = 0(2х - 3)(2х + 3) = 02х - 3 = 0 or 2х + 3 = 0х = 3/2 or х = -3/2
5) х2 + х = 0х(х + 1) = 0х = 0 or х = -1
6) 8 - 2с2 = 02с2 = 8с2 = 4с = ±2
1) 2-5х=14
-5х = 12
х = -12/5 or х = -2.4
2) 9 + 4х2 - 12х = 0
4х2 - 12х + 9 = 0
(2х - 3)2 = 0
2х - 3 = 0
х = 3/2 or х = 1.5
3) 2х2 - 9х - 5 = 0
(2х + 1)(х - 5) = 0
2х + 1 = 0 or х - 5 = 0
х = -1/2 or х = 5
4) 4х2 = 9 = 16х
4х2 - 16х - 9 = 0
(2х - 3)(2х + 3) = 0
2х - 3 = 0 or 2х + 3 = 0
х = 3/2 or х = -3/2
5) х2 + х = 0
х(х + 1) = 0
х = 0 or х = -1
6) 8 - 2с2 = 0
2с2 = 8
с2 = 4
с = ±2