Question

$(5x+1)^{2}=400$

Answer 1

(5x+1)²=400

√(5x+1)²=20

|5x+1|=20

5x+1=20 ∨ 5x+1=-20

5x=19 ∨ 5x=-21

x=19/5 ∨ x=-21/5

 

Answer 2

(5х+1)²=400

√(5х+1)²=20

|5x+1|=20

5x+1 = 20      или     5х+1 = -20

х = 19/5                   х = -21/5