2x^2+2x+31=0

Solution for 2x^2+2x+31=0 equation:

Simplifying
2x2 + 2x + 31 = 0

Reorder the terms:
31 + 2x + 2x2 = 0

Solving
31 + 2x + 2x2 = 0

Solving for variable 'x'.

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

Divide each side by '2'.
15.5 + x + x2 = 0

Move the constant term to the right:

Add '-15.5' to each side of the equation.
15.5 + x + -15.5 + x2 = 0 + -15.5

Reorder the terms:
15.5 + -15.5 + x + x2 = 0 + -15.5

Combine like terms: 15.5 + -15.5 = 0.0
0.0 + x + x2 = 0 + -15.5
x + x2 = 0 + -15.5

Combine like terms: 0 + -15.5 = -15.5
x + x2 = -15.5

The x term is x.  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 + x2 = -15.5 + 0.25

Combine like terms:  + 0.25 = 1.25
1.25 + x2 = -15.5 + 0.25

Combine like terms: -15.5 + 0.25 = -15.25
1.25 + x2 = -15.25

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = -15.25

Can't calculate square root of the right side.

The solution to this equation could not be determined.