x^2=0
x=0
x^2=-2
x € R
x^2=16
x=+4
x=-4
x=4
4x^2=64
x^2=16
x=+4
x=-4
x=4
3x^2=108
x^2=36
x=+6
x=-6
x=6
x^2+4=5
x^2=5-4
x^2=+1
x^2=-1
x^2=1
3x^2+2=1^2+(-1)^2
3x^2+2=1+1
3x^2+2=2
3x^2=0
x^2=0
x=0
[tex] {x}^{2} + 1 = ( \sqrt{3) ^{2} } \\ {x}^{2} + 1 = 3 \\ {x}^{2} = 3 - 1 \\ {x}^{2} = 2 \\ {x}^{2} = + \sqrt{2} \\ {x}^{2} = - \sqrt{2} \\ {x}^{2} = \sqrt{2} [/tex]
x^2=4/25
x=+2/5
x=-2/5
x=2/5