Решите задачу:
(5х+1)²=400
√(5х+1)²=20
|5x+1|=20
5x+1 = 20 или 5х+1 = -20
х = 19/5 х = -21/5
(5x+1)²=400
√(5x+1)²=20
5x+1=20 ∨ 5x+1=-20
5x=19 ∨ 5x=-21
x=19/5 ∨ x=-21/5