1) (х+1)(х-2)=4
х²-2х+х-2-4=0
х²-х-6=0
2) 8х=(х-4)(х+4)
7х=х²-16
х²-7х-16=0
3) (х+2)²-13=3(х-1)
х²+4х+4-13=3х-3
х²+4х-9-3х-3=0
х²+х-12=0
4) 4х²-5=2х(1+3х)
4х²-5=2х+6х²
4х²-5-2х-6х²=0
-2х²-2х-5=0
5) (х+3)²-6=8+10х
х²+6х+9-6-8-10х=0
х²-4х-5=0
6) 4(х+8)=(х-4)(х+2)
4х+32=х²+2х-4х-8
4х+32=х²-2х-8
4х+32-х²+2х+8=0
-х²+6х+40=0
7) 2(2х+3)=(2х+3)²-8
4х+6=4х²+12х+9-8
4х+6=4х²-12х+1
4х+6-4х²+12х-1=0
-4х²+16х+5=0
8) 3(х-1)(х+1)+11=5(2+х)
3(х²-1)+11=10+5х
3х²-3+11-10-5х=0
3х²-5х-2=0