3x^2+36x+31=0

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Solution for 3x^2+36x+31=0 equation:


Simplifying
3x2 + 36x + 31 = 0

Reorder the terms:
31 + 36x + 3x2 = 0

Solving
31 + 36x + 3x2 = 0

Solving for variable 'x'.

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

Divide each side by '3'.
10.33333333 + 12x + x2 = 0

Move the constant term to the right:

Add '-10.33333333' to each side of the equation.
10.33333333 + 12x + -10.33333333 + x2 = 0 + -10.33333333

Reorder the terms:
10.33333333 + -10.33333333 + 12x + x2 = 0 + -10.33333333

Combine like terms: 10.33333333 + -10.33333333 = 0.00000000
0.00000000 + 12x + x2 = 0 + -10.33333333
12x + x2 = 0 + -10.33333333

Combine like terms: 0 + -10.33333333 = -10.33333333
12x + x2 = -10.33333333

The x term is 12x.  Take half its coefficient (6).
Square it (36) and add it to both sides.

Add '36' to each side of the equation.
12x + 36 + x2 = -10.33333333 + 36

Reorder the terms:
36 + 12x + x2 = -10.33333333 + 36

Combine like terms: -10.33333333 + 36 = 25.66666667
36 + 12x + x2 = 25.66666667

Factor a perfect square on the left side:
(x + 6)(x + 6) = 25.66666667

Calculate the square root of the right side: 5.066228052

Break this problem into two subproblems by setting 
(x + 6) equal to 5.066228052 and -5.066228052.

Subproblem 1

x + 6 = 5.066228052 Simplifying x + 6 = 5.066228052 Reorder the terms: 6 + x = 5.066228052 Solving 6 + x = 5.066228052 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-6' to each side of the equation. 6 + -6 + x = 5.066228052 + -6 Combine like terms: 6 + -6 = 0 0 + x = 5.066228052 + -6 x = 5.066228052 + -6 Combine like terms: 5.066228052 + -6 = -0.933771948 x = -0.933771948 Simplifying x = -0.933771948

Subproblem 2

x + 6 = -5.066228052 Simplifying x + 6 = -5.066228052 Reorder the terms: 6 + x = -5.066228052 Solving 6 + x = -5.066228052 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-6' to each side of the equation. 6 + -6 + x = -5.066228052 + -6 Combine like terms: 6 + -6 = 0 0 + x = -5.066228052 + -6 x = -5.066228052 + -6 Combine like terms: -5.066228052 + -6 = -11.066228052 x = -11.066228052 Simplifying x = -11.066228052

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.933771948, -11.066228052}

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