1+0.5z+0.5z^2=0

Solution for 1+0.5z+0.5z^2=0 equation:

Simplifying
1 + 0.5z + 0.5z2 = 0

Solving
1 + 0.5z + 0.5z2 = 0

Solving for variable 'z'.

Begin completing the square.  Divide all terms by
0.5 the coefficient of the squared term: 

Divide each side by '0.5'.
2 + z + z2 = 0

Move the constant term to the right:

Add '-2' to each side of the equation.
2 + z + -2 + z2 = 0 + -2

Reorder the terms:
2 + -2 + z + z2 = 0 + -2

Combine like terms: 2 + -2 = 0
0 + z + z2 = 0 + -2
z + z2 = 0 + -2

Combine like terms: 0 + -2 = -2
z + z2 = -2

The z term is z.  Take half its coefficient (0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
 + 0.25 + z2 = -2 + 0.25

Combine like terms:  + 0.25 = 1.25
1.25 + z2 = -2 + 0.25

Combine like terms: -2 + 0.25 = -1.75
1.25 + z2 = -1.75

Factor a perfect square on the left side:
(z + 0.5)(z + 0.5) = -1.75

Can't calculate square root of the right side.

The solution to this equation could not be determined.