8x^2+4x+0.5=0

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Solution for 8x^2+4x+0.5=0 equation:


Simplifying
8x2 + 4x + 0.5 = 0

Reorder the terms:
0.5 + 4x + 8x2 = 0

Solving
0.5 + 4x + 8x2 = 0

Solving for variable 'x'.

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

Divide each side by '8'.
0.0625 + 0.5x + x2 = 0

Move the constant term to the right:

Add '-0.0625' to each side of the equation.
0.0625 + 0.5x + -0.0625 + x2 = 0 + -0.0625

Reorder the terms:
0.0625 + -0.0625 + 0.5x + x2 = 0 + -0.0625

Combine like terms: 0.0625 + -0.0625 = 0.0000
0.0000 + 0.5x + x2 = 0 + -0.0625
0.5x + x2 = 0 + -0.0625

Combine like terms: 0 + -0.0625 = -0.0625
0.5x + x2 = -0.0625

The x term is 0.5x.  Take half its coefficient (0.25).
Square it (0.0625) and add it to both sides.

Add '0.0625' to each side of the equation.
0.5x + 0.0625 + x2 = -0.0625 + 0.0625

Reorder the terms:
0.0625 + 0.5x + x2 = -0.0625 + 0.0625

Combine like terms: -0.0625 + 0.0625 = 0.0000
0.0625 + 0.5x + x2 = 0.0000

Factor a perfect square on the left side:
(x + 0.25)(x + 0.25) = 0.0000

Calculate the square root of the right side: 0.0000

Break this problem into two subproblems by setting 
(x + 0.25) equal to 0.0000 and 0.0000.

Subproblem 1

x + 0.25 = 0.0000 Simplifying x + 0.25 = 0.0000 Reorder the terms: 0.25 + x = 0.0000 Solving 0.25 + x = 0.0000 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.25' to each side of the equation. 0.25 + -0.25 + x = 0.0000 + -0.25 Combine like terms: 0.25 + -0.25 = 0.00 0.00 + x = 0.0000 + -0.25 x = 0.0000 + -0.25 Combine like terms: 0.0000 + -0.25 = -0.25 x = -0.25 Simplifying x = -0.25

Subproblem 2

x + 0.25 = 0.0000 Simplifying x + 0.25 = 0.0000 Reorder the terms: 0.25 + x = 0.0000 Solving 0.25 + x = 0.0000 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.25' to each side of the equation. 0.25 + -0.25 + x = 0.0000 + -0.25 Combine like terms: 0.25 + -0.25 = 0.00 0.00 + x = 0.0000 + -0.25 x = 0.0000 + -0.25 Combine like terms: 0.0000 + -0.25 = -0.25 x = -0.25 Simplifying x = -0.25

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.25, -0.25}

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