2x+3x^2=666

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Solution for 2x+3x^2=666 equation:


Simplifying
2x + 3x2 = 666

Solving
2x + 3x2 = 666

Solving for variable 'x'.

Reorder the terms:
-666 + 2x + 3x2 = 666 + -666

Combine like terms: 666 + -666 = 0
-666 + 2x + 3x2 = 0

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

Divide each side by '3'.
-222 + 0.6666666667x + x2 = 0

Move the constant term to the right:

Add '222' to each side of the equation.
-222 + 0.6666666667x + 222 + x2 = 0 + 222

Reorder the terms:
-222 + 222 + 0.6666666667x + x2 = 0 + 222

Combine like terms: -222 + 222 = 0
0 + 0.6666666667x + x2 = 0 + 222
0.6666666667x + x2 = 0 + 222

Combine like terms: 0 + 222 = 222
0.6666666667x + x2 = 222

The x term is 0.6666666667x.  Take half its coefficient (0.3333333334).
Square it (0.1111111112) and add it to both sides.

Add '0.1111111112' to each side of the equation.
0.6666666667x + 0.1111111112 + x2 = 222 + 0.1111111112

Reorder the terms:
0.1111111112 + 0.6666666667x + x2 = 222 + 0.1111111112

Combine like terms: 222 + 0.1111111112 = 222.1111111112
0.1111111112 + 0.6666666667x + x2 = 222.1111111112

Factor a perfect square on the left side:
(x + 0.3333333334)(x + 0.3333333334) = 222.1111111112

Calculate the square root of the right side: 14.903392604

Break this problem into two subproblems by setting 
(x + 0.3333333334) equal to 14.903392604 and -14.903392604.

Subproblem 1

x + 0.3333333334 = 14.903392604 Simplifying x + 0.3333333334 = 14.903392604 Reorder the terms: 0.3333333334 + x = 14.903392604 Solving 0.3333333334 + x = 14.903392604 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.3333333334' to each side of the equation. 0.3333333334 + -0.3333333334 + x = 14.903392604 + -0.3333333334 Combine like terms: 0.3333333334 + -0.3333333334 = 0.0000000000 0.0000000000 + x = 14.903392604 + -0.3333333334 x = 14.903392604 + -0.3333333334 Combine like terms: 14.903392604 + -0.3333333334 = 14.5700592706 x = 14.5700592706 Simplifying x = 14.5700592706

Subproblem 2

x + 0.3333333334 = -14.903392604 Simplifying x + 0.3333333334 = -14.903392604 Reorder the terms: 0.3333333334 + x = -14.903392604 Solving 0.3333333334 + x = -14.903392604 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.3333333334' to each side of the equation. 0.3333333334 + -0.3333333334 + x = -14.903392604 + -0.3333333334 Combine like terms: 0.3333333334 + -0.3333333334 = 0.0000000000 0.0000000000 + x = -14.903392604 + -0.3333333334 x = -14.903392604 + -0.3333333334 Combine like terms: -14.903392604 + -0.3333333334 = -15.2367259374 x = -15.2367259374 Simplifying x = -15.2367259374

Solution

The solution to the problem is based on the solutions from the subproblems. x = {14.5700592706, -15.2367259374}

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