4( x - 1)² = 12x + 3
4( x² - 2x + 1) = 12x + 3
4x² - 8x + 4 = 12x + 3
4x² - 8x - 12x + 4 - 3 = 0
4x² - 20x + 1 = 0
D = b² - 4ac = 400 - 4×4 = 400 - 16 = 384
x1,2 = ( 20 +/- √384) / 8
14x-3x<14+9
17x-14x>5-21
11x<23
3x>-16
x<23/11
x<-16/3
- бесконечности до -5(1/3)
5x^2-18x-8<=0
D=324+4*5*8=324+160=468
x1=(18+V468)/10=(18+6V13)/10=(9+3V13)/5
x2=(9-3V13)/5
x€[(9-3V13)/5; (9+3V13)/5]
5х+3=2х+1
|5х+3|=|2х+1|
х=1,5