5x^2+31x-31=0

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


Simplifying
5x2 + 31x + -31 = 0

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

Solving
-31 + 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'.
-6.2 + 6.2x + x2 = 0

Move the constant term to the right:

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

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

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

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

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 = 6.2 + 9.61

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

Combine like terms: 6.2 + 9.61 = 15.81
9.61 + 6.2x + x2 = 15.81

Factor a perfect square on the left side:
(x + 3.1)(x + 3.1) = 15.81

Calculate the square root of the right side: 3.97617907

Break this problem into two subproblems by setting 
(x + 3.1) equal to 3.97617907 and -3.97617907.

Subproblem 1

x + 3.1 = 3.97617907 Simplifying x + 3.1 = 3.97617907 Reorder the terms: 3.1 + x = 3.97617907 Solving 3.1 + x = 3.97617907 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 = 3.97617907 + -3.1 Combine like terms: 3.1 + -3.1 = 0.0 0.0 + x = 3.97617907 + -3.1 x = 3.97617907 + -3.1 Combine like terms: 3.97617907 + -3.1 = 0.87617907 x = 0.87617907 Simplifying x = 0.87617907

Subproblem 2

x + 3.1 = -3.97617907 Simplifying x + 3.1 = -3.97617907 Reorder the terms: 3.1 + x = -3.97617907 Solving 3.1 + x = -3.97617907 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 = -3.97617907 + -3.1 Combine like terms: 3.1 + -3.1 = 0.0 0.0 + x = -3.97617907 + -3.1 x = -3.97617907 + -3.1 Combine like terms: -3.97617907 + -3.1 = -7.07617907 x = -7.07617907 Simplifying x = -7.07617907

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.87617907, -7.07617907}

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