Question

|x+1|+|x+1|=2

Answer 1

|x + 1| + |x + 1| = 2

|x + 1| . 2 = 2

|x + 1| = 2 : 2

|x + 1| = 1

x + 1 = 1 hoặc x + 1 = (-1)

x = 1 - 1 hoặc x = (-1) - 1

x = 0 hoặc x = (-2)

Answer 2

|x + 1| + |x + 1| = 2

|x + 1| . 2 = 2

|x + 1| = 2 : 2

|x + 1| = 1

⇒\(\left[{}\begin{matrix}\text{x + 1 = 1 }\\\text{x + 1 = (-1)}\end{matrix}\right.\)

⇒\(\left[{}\begin{matrix}\text{x = 1 - 1}\\\text{x = (-1) - 1}\end{matrix}\right.\)

⇒\(\left[{}\begin{matrix}x=0\\x=-2\end{matrix}\right.\)

Vậy x = 0 hoặc x = -2