(5х-1)(5х+1)-25х2-5х-38=25x2-1-25x2-5x-38=-5x-39
х =130; -5*130-39=−689
(5x-1)(5x+1)-25x^2-5x-38=-1-5*x-38=-39-5x-39-5x=-39-5*130=-39-650=-689
(5х-1)(5х+1)-25х2-5х-38=25x2-1-25x2-5x-38=-5x-39
х =130; -5*130-39=−689
(5x-1)(5x+1)-25x^2-5x-38=-1-5*x-38=-39-5x
-39-5x=-39-5*130=-39-650=-689