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x^2 +4=0
x^2 = -4
x = 2i
Con (2)
4x^2+4x=0
4x^2+4x = 0
4 (x^2 + x)=0 ► 0/4 = 0
x^2 + x = 0
x(x + 1) = 0 ► 0/x = 0
x + 1 = 0
x = -1
Con (3)
8x^2+6x+10x=0
8x^2+16x =0
8x (x+2) =0 ► 0/8x =0
x+2 =0
x = -2
Con (4)
4x^2-6=0
4x^2 = 6
4(x^2) = 6
x^2 = 6/4
x^2 = 1,25
x = 1,2247