[tex](1 + x)^{2} = {1}^{2} + x^{2} [/tex]
[tex]1 + 2x \times {x}^{2} = {1}^{2} + {x}^{2} = > 1 + 2x \times {x}^{2} = 1 + {x}^{2} [/tex]
[tex]2x + {x}^{2} = 0 + {x}^{2} = > 2x = 0[/tex]
[tex]x = 0[/tex]
[tex](1 + 0)^{2} = {1}^{2} + {0}^{2} [/tex]
[tex] {1}^{2} = {1}^{2} + {0}^{2} [/tex]
[tex]1 = 1 + 0 [/tex]
[tex]1 = 1[/tex]