(3-2x)(x+7)>=0
x<=-7 x>=1.5
x²-4x+4>0
(x-2)²>0
x<2 x>2
1(х-8)(х+8)
а) ......=х²-4х+4 - х²-2х+х+2= - 5х+6
б) ......=25у² - 2у=у(25у - 2)
в) .....=х²-9+4х²+6х=5х²+6х - 9