Question

РЕШИТЕ ЗАМЕНОЙ
(x²+3x+1)+x²+3x-1=0

Answer 1

(х^2 + 3х + 1) + х^2 + 3х - 1 = 0

х^2 + 3х = у

у + 1 + у - 1 = 0

2у = 0

у = 0

х^2 + 3х = 0

х(х + 3) = 0

х = 0

х + 3 = 0

х = - 3