Question

срочно решите!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Answer 1

4(х+1)-4(х-1)=(х-1)(х+1)
4х+4-4х+4=х^2-х+х-1
8=х^2-1
х^2=9
х=+-3

Answer 2

спасибо 

Answer 3

не за что ;-)