5x^2+31x-6=0

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Solution for 5x^2+31x-6=0 equation:


Simplifying
5x2 + 31x + -6 = 0

Reorder the terms:
-6 + 31x + 5x2 = 0

Solving
-6 + 31x + 5x2 = 0

Solving for variable 'x'.

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

Divide each side by '5'.
-1.2 + 6.2x + x2 = 0

Move the constant term to the right:

Add '1.2' to each side of the equation.
-1.2 + 6.2x + 1.2 + x2 = 0 + 1.2

Reorder the terms:
-1.2 + 1.2 + 6.2x + x2 = 0 + 1.2

Combine like terms: -1.2 + 1.2 = 0.0
0.0 + 6.2x + x2 = 0 + 1.2
6.2x + x2 = 0 + 1.2

Combine like terms: 0 + 1.2 = 1.2
6.2x + x2 = 1.2

The x term is 6.2x.  Take half its coefficient (3.1).
Square it (9.61) and add it to both sides.

Add '9.61' to each side of the equation.
6.2x + 9.61 + x2 = 1.2 + 9.61

Reorder the terms:
9.61 + 6.2x + x2 = 1.2 + 9.61

Combine like terms: 1.2 + 9.61 = 10.81
9.61 + 6.2x + x2 = 10.81

Factor a perfect square on the left side:
(x + 3.1)(x + 3.1) = 10.81

Calculate the square root of the right side: 3.287856445

Break this problem into two subproblems by setting 
(x + 3.1) equal to 3.287856445 and -3.287856445.

Subproblem 1

x + 3.1 = 3.287856445 Simplifying x + 3.1 = 3.287856445 Reorder the terms: 3.1 + x = 3.287856445 Solving 3.1 + x = 3.287856445 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.1' to each side of the equation. 3.1 + -3.1 + x = 3.287856445 + -3.1 Combine like terms: 3.1 + -3.1 = 0.0 0.0 + x = 3.287856445 + -3.1 x = 3.287856445 + -3.1 Combine like terms: 3.287856445 + -3.1 = 0.187856445 x = 0.187856445 Simplifying x = 0.187856445

Subproblem 2

x + 3.1 = -3.287856445 Simplifying x + 3.1 = -3.287856445 Reorder the terms: 3.1 + x = -3.287856445 Solving 3.1 + x = -3.287856445 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.1' to each side of the equation. 3.1 + -3.1 + x = -3.287856445 + -3.1 Combine like terms: 3.1 + -3.1 = 0.0 0.0 + x = -3.287856445 + -3.1 x = -3.287856445 + -3.1 Combine like terms: -3.287856445 + -3.1 = -6.387856445 x = -6.387856445 Simplifying x = -6.387856445

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.187856445, -6.387856445}

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