x^2-1.414x-1=0

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Solution for x^2-1.414x-1=0 equation:


Simplifying
x2 + -1.414x + -1 = 0

Reorder the terms:
-1 + -1.414x + x2 = 0

Solving
-1 + -1.414x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '1' to each side of the equation.
-1 + -1.414x + 1 + x2 = 0 + 1

Reorder the terms:
-1 + 1 + -1.414x + x2 = 0 + 1

Combine like terms: -1 + 1 = 0
0 + -1.414x + x2 = 0 + 1
-1.414x + x2 = 0 + 1

Combine like terms: 0 + 1 = 1
-1.414x + x2 = 1

The x term is -1.414x.  Take half its coefficient (-0.707).
Square it (0.499849) and add it to both sides.

Add '0.499849' to each side of the equation.
-1.414x + 0.499849 + x2 = 1 + 0.499849

Reorder the terms:
0.499849 + -1.414x + x2 = 1 + 0.499849

Combine like terms: 1 + 0.499849 = 1.499849
0.499849 + -1.414x + x2 = 1.499849

Factor a perfect square on the left side:
(x + -0.707)(x + -0.707) = 1.499849

Calculate the square root of the right side: 1.224683224

Break this problem into two subproblems by setting 
(x + -0.707) equal to 1.224683224 and -1.224683224.

Subproblem 1

x + -0.707 = 1.224683224 Simplifying x + -0.707 = 1.224683224 Reorder the terms: -0.707 + x = 1.224683224 Solving -0.707 + x = 1.224683224 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.707' to each side of the equation. -0.707 + 0.707 + x = 1.224683224 + 0.707 Combine like terms: -0.707 + 0.707 = 0.000 0.000 + x = 1.224683224 + 0.707 x = 1.224683224 + 0.707 Combine like terms: 1.224683224 + 0.707 = 1.931683224 x = 1.931683224 Simplifying x = 1.931683224

Subproblem 2

x + -0.707 = -1.224683224 Simplifying x + -0.707 = -1.224683224 Reorder the terms: -0.707 + x = -1.224683224 Solving -0.707 + x = -1.224683224 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.707' to each side of the equation. -0.707 + 0.707 + x = -1.224683224 + 0.707 Combine like terms: -0.707 + 0.707 = 0.000 0.000 + x = -1.224683224 + 0.707 x = -1.224683224 + 0.707 Combine like terms: -1.224683224 + 0.707 = -0.517683224 x = -0.517683224 Simplifying x = -0.517683224

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.931683224, -0.517683224}

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