49х^2-100=0
49х^2=100
х^2=100/49
х1=10/7, х2=-10/7
б)2х(8х-4)-(4х-2)(4х+2)=-12
16х^2-8х-16х^2-4+12=0
8х=8
х=1
49х^2-100=0
49х^2=100
х^2=100/49
х1=10/7, х2=-10/7
б)2х(8х-4)-(4х-2)(4х+2)=-12
16х^2-8х-16х^2-4+12=0
8х=8
х=1