-x^2-1.8x+.11286=0

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Solution for -x^2-1.8x+.11286=0 equation:


Simplifying
-1x2 + -1.8x + 0.11286 = 0

Reorder the terms:
0.11286 + -1.8x + -1x2 = 0

Solving
0.11286 + -1.8x + -1x2 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-0.11286 + 1.8x + x2 = 0

Move the constant term to the right:

Add '0.11286' to each side of the equation.
-0.11286 + 1.8x + 0.11286 + x2 = 0 + 0.11286

Reorder the terms:
-0.11286 + 0.11286 + 1.8x + x2 = 0 + 0.11286

Combine like terms: -0.11286 + 0.11286 = 0.00000
0.00000 + 1.8x + x2 = 0 + 0.11286
1.8x + x2 = 0 + 0.11286

Combine like terms: 0 + 0.11286 = 0.11286
1.8x + x2 = 0.11286

The x term is 1.8x.  Take half its coefficient (0.9).
Square it (0.81) and add it to both sides.

Add '0.81' to each side of the equation.
1.8x + 0.81 + x2 = 0.11286 + 0.81

Reorder the terms:
0.81 + 1.8x + x2 = 0.11286 + 0.81

Combine like terms: 0.11286 + 0.81 = 0.92286
0.81 + 1.8x + x2 = 0.92286

Factor a perfect square on the left side:
(x + 0.9)(x + 0.9) = 0.92286

Calculate the square root of the right side: 0.960656026

Break this problem into two subproblems by setting 
(x + 0.9) equal to 0.960656026 and -0.960656026.

Subproblem 1

x + 0.9 = 0.960656026 Simplifying x + 0.9 = 0.960656026 Reorder the terms: 0.9 + x = 0.960656026 Solving 0.9 + x = 0.960656026 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.9' to each side of the equation. 0.9 + -0.9 + x = 0.960656026 + -0.9 Combine like terms: 0.9 + -0.9 = 0.0 0.0 + x = 0.960656026 + -0.9 x = 0.960656026 + -0.9 Combine like terms: 0.960656026 + -0.9 = 0.060656026 x = 0.060656026 Simplifying x = 0.060656026

Subproblem 2

x + 0.9 = -0.960656026 Simplifying x + 0.9 = -0.960656026 Reorder the terms: 0.9 + x = -0.960656026 Solving 0.9 + x = -0.960656026 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.9' to each side of the equation. 0.9 + -0.9 + x = -0.960656026 + -0.9 Combine like terms: 0.9 + -0.9 = 0.0 0.0 + x = -0.960656026 + -0.9 x = -0.960656026 + -0.9 Combine like terms: -0.960656026 + -0.9 = -1.860656026 x = -1.860656026 Simplifying x = -1.860656026

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.060656026, -1.860656026}

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