3x^2+2x+1=331

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Solution for 3x^2+2x+1=331 equation:


Simplifying
3x2 + 2x + 1 = 331

Reorder the terms:
1 + 2x + 3x2 = 331

Solving
1 + 2x + 3x2 = 331

Solving for variable 'x'.

Reorder the terms:
1 + -331 + 2x + 3x2 = 331 + -331

Combine like terms: 1 + -331 = -330
-330 + 2x + 3x2 = 331 + -331

Combine like terms: 331 + -331 = 0
-330 + 2x + 3x2 = 0

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

Divide each side by '3'.
-110 + 0.6666666667x + x2 = 0

Move the constant term to the right:

Add '110' to each side of the equation.
-110 + 0.6666666667x + 110 + x2 = 0 + 110

Reorder the terms:
-110 + 110 + 0.6666666667x + x2 = 0 + 110

Combine like terms: -110 + 110 = 0
0 + 0.6666666667x + x2 = 0 + 110
0.6666666667x + x2 = 0 + 110

Combine like terms: 0 + 110 = 110
0.6666666667x + x2 = 110

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 = 110 + 0.1111111112

Reorder the terms:
0.1111111112 + 0.6666666667x + x2 = 110 + 0.1111111112

Combine like terms: 110 + 0.1111111112 = 110.1111111112
0.1111111112 + 0.6666666667x + x2 = 110.1111111112

Factor a perfect square on the left side:
(x + 0.3333333334)(x + 0.3333333334) = 110.1111111112

Calculate the square root of the right side: 10.493384159

Break this problem into two subproblems by setting 
(x + 0.3333333334) equal to 10.493384159 and -10.493384159.

Subproblem 1

x + 0.3333333334 = 10.493384159 Simplifying x + 0.3333333334 = 10.493384159 Reorder the terms: 0.3333333334 + x = 10.493384159 Solving 0.3333333334 + x = 10.493384159 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 = 10.493384159 + -0.3333333334 Combine like terms: 0.3333333334 + -0.3333333334 = 0.0000000000 0.0000000000 + x = 10.493384159 + -0.3333333334 x = 10.493384159 + -0.3333333334 Combine like terms: 10.493384159 + -0.3333333334 = 10.1600508256 x = 10.1600508256 Simplifying x = 10.1600508256

Subproblem 2

x + 0.3333333334 = -10.493384159 Simplifying x + 0.3333333334 = -10.493384159 Reorder the terms: 0.3333333334 + x = -10.493384159 Solving 0.3333333334 + x = -10.493384159 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 = -10.493384159 + -0.3333333334 Combine like terms: 0.3333333334 + -0.3333333334 = 0.0000000000 0.0000000000 + x = -10.493384159 + -0.3333333334 x = -10.493384159 + -0.3333333334 Combine like terms: -10.493384159 + -0.3333333334 = -10.8267174924 x = -10.8267174924 Simplifying x = -10.8267174924

Solution

The solution to the problem is based on the solutions from the subproblems. x = {10.1600508256, -10.8267174924}

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