1.666=x^2+2x

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Solution for 1.666=x^2+2x equation:


Simplifying
1.666 = x2 + 2x

Reorder the terms:
1.666 = 2x + x2

Solving
1.666 = 2x + x2

Solving for variable 'x'.

Reorder the terms:
1.666 + -2x + -1x2 = 2x + -2x + x2 + -1x2

Combine like terms: 2x + -2x = 0
1.666 + -2x + -1x2 = 0 + x2 + -1x2
1.666 + -2x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
1.666 + -2x + -1x2 = 0

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

Divide each side by '-1'.
-1.666 + 2x + x2 = 0

Move the constant term to the right:

Add '1.666' to each side of the equation.
-1.666 + 2x + 1.666 + x2 = 0 + 1.666

Reorder the terms:
-1.666 + 1.666 + 2x + x2 = 0 + 1.666

Combine like terms: -1.666 + 1.666 = 0.000
0.000 + 2x + x2 = 0 + 1.666
2x + x2 = 0 + 1.666

Combine like terms: 0 + 1.666 = 1.666
2x + x2 = 1.666

The x term is 2x.  Take half its coefficient (1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
2x + 1 + x2 = 1.666 + 1

Reorder the terms:
1 + 2x + x2 = 1.666 + 1

Combine like terms: 1.666 + 1 = 2.666
1 + 2x + x2 = 2.666

Factor a perfect square on the left side:
(x + 1)(x + 1) = 2.666

Calculate the square root of the right side: 1.632789025

Break this problem into two subproblems by setting 
(x + 1) equal to 1.632789025 and -1.632789025.

Subproblem 1

x + 1 = 1.632789025 Simplifying x + 1 = 1.632789025 Reorder the terms: 1 + x = 1.632789025 Solving 1 + x = 1.632789025 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + x = 1.632789025 + -1 Combine like terms: 1 + -1 = 0 0 + x = 1.632789025 + -1 x = 1.632789025 + -1 Combine like terms: 1.632789025 + -1 = 0.632789025 x = 0.632789025 Simplifying x = 0.632789025

Subproblem 2

x + 1 = -1.632789025 Simplifying x + 1 = -1.632789025 Reorder the terms: 1 + x = -1.632789025 Solving 1 + x = -1.632789025 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + x = -1.632789025 + -1 Combine like terms: 1 + -1 = 0 0 + x = -1.632789025 + -1 x = -1.632789025 + -1 Combine like terms: -1.632789025 + -1 = -2.632789025 x = -2.632789025 Simplifying x = -2.632789025

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.632789025, -2.632789025}

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