Упростить: (5х-1) * (5х+1) - 25х2
(5х-1) * (5х+1) - 25х2 = 25X2-5X-5X-1-25X2 = -10X-1=0
(5х-1) * (5х+1) - 25х2 =
=25X2-5X-5X-1-25X2 =
=-10X-1=
=-(10х+1)