x^2-0.86*x-0.038=0

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Solution for x^2-0.86*x-0.038=0 equation:


Simplifying
x2 + -0.86x + -0.038 = 0

Reorder the terms:
-0.038 + -0.86x + x2 = 0

Solving
-0.038 + -0.86x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '0.038' to each side of the equation.
-0.038 + -0.86x + 0.038 + x2 = 0 + 0.038

Reorder the terms:
-0.038 + 0.038 + -0.86x + x2 = 0 + 0.038

Combine like terms: -0.038 + 0.038 = 0.000
0.000 + -0.86x + x2 = 0 + 0.038
-0.86x + x2 = 0 + 0.038

Combine like terms: 0 + 0.038 = 0.038
-0.86x + x2 = 0.038

The x term is -0.86x.  Take half its coefficient (-0.43).
Square it (0.1849) and add it to both sides.

Add '0.1849' to each side of the equation.
-0.86x + 0.1849 + x2 = 0.038 + 0.1849

Reorder the terms:
0.1849 + -0.86x + x2 = 0.038 + 0.1849

Combine like terms: 0.038 + 0.1849 = 0.2229
0.1849 + -0.86x + x2 = 0.2229

Factor a perfect square on the left side:
(x + -0.43)(x + -0.43) = 0.2229

Calculate the square root of the right side: 0.472122865

Break this problem into two subproblems by setting 
(x + -0.43) equal to 0.472122865 and -0.472122865.

Subproblem 1

x + -0.43 = 0.472122865 Simplifying x + -0.43 = 0.472122865 Reorder the terms: -0.43 + x = 0.472122865 Solving -0.43 + x = 0.472122865 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.43' to each side of the equation. -0.43 + 0.43 + x = 0.472122865 + 0.43 Combine like terms: -0.43 + 0.43 = 0.00 0.00 + x = 0.472122865 + 0.43 x = 0.472122865 + 0.43 Combine like terms: 0.472122865 + 0.43 = 0.902122865 x = 0.902122865 Simplifying x = 0.902122865

Subproblem 2

x + -0.43 = -0.472122865 Simplifying x + -0.43 = -0.472122865 Reorder the terms: -0.43 + x = -0.472122865 Solving -0.43 + x = -0.472122865 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.43' to each side of the equation. -0.43 + 0.43 + x = -0.472122865 + 0.43 Combine like terms: -0.43 + 0.43 = 0.00 0.00 + x = -0.472122865 + 0.43 x = -0.472122865 + 0.43 Combine like terms: -0.472122865 + 0.43 = -0.042122865 x = -0.042122865 Simplifying x = -0.042122865

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.902122865, -0.042122865}

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