3x^2+x=.6666

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Solution for 3x^2+x=.6666 equation:


Simplifying
3x2 + x = 0.6666

Reorder the terms:
x + 3x2 = 0.6666

Solving
x + 3x2 = 0.6666

Solving for variable 'x'.

Reorder the terms:
-0.6666 + x + 3x2 = 0.6666 + -0.6666

Combine like terms: 0.6666 + -0.6666 = 0.0000
-0.6666 + x + 3x2 = 0.0000

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

Divide each side by '3'.
-0.2222 + 0.3333333333x + x2 = 0.0000

Move the constant term to the right:

Add '0.2222' to each side of the equation.
-0.2222 + 0.3333333333x + 0.2222 + x2 = 0.0000 + 0.2222

Reorder the terms:
-0.2222 + 0.2222 + 0.3333333333x + x2 = 0.0000 + 0.2222

Combine like terms: -0.2222 + 0.2222 = 0.0000
0.0000 + 0.3333333333x + x2 = 0.0000 + 0.2222
0.3333333333x + x2 = 0.0000 + 0.2222

Combine like terms: 0.0000 + 0.2222 = 0.2222
0.3333333333x + x2 = 0.2222

The x term is x.  Take half its coefficient (0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
0.3333333333x + 0.25 + x2 = 0.2222 + 0.25

Reorder the terms:
0.25 + 0.3333333333x + x2 = 0.2222 + 0.25

Combine like terms: 0.2222 + 0.25 = 0.4722
0.25 + 0.3333333333x + x2 = 0.4722

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 0.4722

Calculate the square root of the right side: 0.687168102

Break this problem into two subproblems by setting 
(x + 0.5) equal to 0.687168102 and -0.687168102.

Subproblem 1

x + 0.5 = 0.687168102 Simplifying x + 0.5 = 0.687168102 Reorder the terms: 0.5 + x = 0.687168102 Solving 0.5 + x = 0.687168102 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = 0.687168102 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 0.687168102 + -0.5 x = 0.687168102 + -0.5 Combine like terms: 0.687168102 + -0.5 = 0.187168102 x = 0.187168102 Simplifying x = 0.187168102

Subproblem 2

x + 0.5 = -0.687168102 Simplifying x + 0.5 = -0.687168102 Reorder the terms: 0.5 + x = -0.687168102 Solving 0.5 + x = -0.687168102 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = -0.687168102 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -0.687168102 + -0.5 x = -0.687168102 + -0.5 Combine like terms: -0.687168102 + -0.5 = -1.187168102 x = -1.187168102 Simplifying x = -1.187168102

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.187168102, -1.187168102}

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