Question

Tìm x biết x^2 + 2x +1 =0

Answer 1

\(x^2+2x+1=0\)

\(\Rightarrow\left(x+1\right)^2=0\)

\(\Rightarrow x+1=0\)

\(\Rightarrow x=-1\)

Answer 2

  

Answer 3

x^2 + 2x +1 =0

=> ( x+1)^2=0

=> x+1=0

=> x = -1

Answer 4

x^2 + 2x + 1 = 0

 (x - 1)^2   = 0

x  - 1 = 0

x       = 1 

Answer 5

Tìm x biết x^2 + 6x+9=0