Question

решите а,б,в,г!!
номер 550

Answer 1

а) (7х+1)(3х-1)-21х^2=3
21х^2-7х+3х-1-21х^2=3
-4х=4
х= -1
б)1-3х-4х+12х^2=12х^2-6х
-3х-4х+12х^2-12х^2+6х= -1
-1х= -1
х=1