(3х+5)^2-64=0
9х∧2+30х+25-64=0
9х∧2+30х-39=0/3
3х∧2+10х-13=0
В=100+156=256
х1=-10-16/6=-26/6=4целых1/3
х2=-10+16/6=1
ответ.....
(3z+5)^2-(4z-7)^2=0
9z∧2+30z+25-16z∧2+56z-49=0
-7z∧2+86z-24=0/(-1)
7z∧2-86z+24=0
D=7396-672=6724
z1=86-82/14=2/7
z2=86+82/14=12
Ответ........