x^2+0.58x-0.4=0

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Solution for x^2+0.58x-0.4=0 equation:


Simplifying
x2 + 0.58x + -0.4 = 0

Reorder the terms:
-0.4 + 0.58x + x2 = 0

Solving
-0.4 + 0.58x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '0.4' to each side of the equation.
-0.4 + 0.58x + 0.4 + x2 = 0 + 0.4

Reorder the terms:
-0.4 + 0.4 + 0.58x + x2 = 0 + 0.4

Combine like terms: -0.4 + 0.4 = 0.0
0.0 + 0.58x + x2 = 0 + 0.4
0.58x + x2 = 0 + 0.4

Combine like terms: 0 + 0.4 = 0.4
0.58x + x2 = 0.4

The x term is 0.58x.  Take half its coefficient (0.29).
Square it (0.0841) and add it to both sides.

Add '0.0841' to each side of the equation.
0.58x + 0.0841 + x2 = 0.4 + 0.0841

Reorder the terms:
0.0841 + 0.58x + x2 = 0.4 + 0.0841

Combine like terms: 0.4 + 0.0841 = 0.4841
0.0841 + 0.58x + x2 = 0.4841

Factor a perfect square on the left side:
(x + 0.29)(x + 0.29) = 0.4841

Calculate the square root of the right side: 0.695772951

Break this problem into two subproblems by setting 
(x + 0.29) equal to 0.695772951 and -0.695772951.

Subproblem 1

x + 0.29 = 0.695772951 Simplifying x + 0.29 = 0.695772951 Reorder the terms: 0.29 + x = 0.695772951 Solving 0.29 + x = 0.695772951 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.29' to each side of the equation. 0.29 + -0.29 + x = 0.695772951 + -0.29 Combine like terms: 0.29 + -0.29 = 0.00 0.00 + x = 0.695772951 + -0.29 x = 0.695772951 + -0.29 Combine like terms: 0.695772951 + -0.29 = 0.405772951 x = 0.405772951 Simplifying x = 0.405772951

Subproblem 2

x + 0.29 = -0.695772951 Simplifying x + 0.29 = -0.695772951 Reorder the terms: 0.29 + x = -0.695772951 Solving 0.29 + x = -0.695772951 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.29' to each side of the equation. 0.29 + -0.29 + x = -0.695772951 + -0.29 Combine like terms: 0.29 + -0.29 = 0.00 0.00 + x = -0.695772951 + -0.29 x = -0.695772951 + -0.29 Combine like terms: -0.695772951 + -0.29 = -0.985772951 x = -0.985772951 Simplifying x = -0.985772951

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.405772951, -0.985772951}

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