(х-1)(х-2)+(х+3)(х-3)+3х+18=0
х^2-2х-х+2+х^2-9+3х+18=0
2х^2+0+11=0
Нет решений
(3х-5)2-5(5-6х)=0
6х-10-25+30х=0
36х-35=0
х=35/36
(х-7)2+7(2х-14)=0
2х-14+14х-98=0
16х-112=0
16х=112
х=7
3x²-14x+16=0
D= 196 - 4×3×16 = √4 = 2
x1 = 14+2/2×3 = 16/6 = 8/3
x2 = 14-2/2×3 =12/6 = 2