31x^2+8x-3=0

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Solution for 31x^2+8x-3=0 equation:


Simplifying
31x2 + 8x + -3 = 0

Reorder the terms:
-3 + 8x + 31x2 = 0

Solving
-3 + 8x + 31x2 = 0

Solving for variable 'x'.

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

Divide each side by '31'.
-0.09677419355 + 0.2580645161x + x2 = 0

Move the constant term to the right:

Add '0.09677419355' to each side of the equation.
-0.09677419355 + 0.2580645161x + 0.09677419355 + x2 = 0 + 0.09677419355

Reorder the terms:
-0.09677419355 + 0.09677419355 + 0.2580645161x + x2 = 0 + 0.09677419355

Combine like terms: -0.09677419355 + 0.09677419355 = 0.00000000000
0.00000000000 + 0.2580645161x + x2 = 0 + 0.09677419355
0.2580645161x + x2 = 0 + 0.09677419355

Combine like terms: 0 + 0.09677419355 = 0.09677419355
0.2580645161x + x2 = 0.09677419355

The x term is 0.2580645161x.  Take half its coefficient (0.1290322581).
Square it (0.01664932363) and add it to both sides.

Add '0.01664932363' to each side of the equation.
0.2580645161x + 0.01664932363 + x2 = 0.09677419355 + 0.01664932363

Reorder the terms:
0.01664932363 + 0.2580645161x + x2 = 0.09677419355 + 0.01664932363

Combine like terms: 0.09677419355 + 0.01664932363 = 0.11342351718
0.01664932363 + 0.2580645161x + x2 = 0.11342351718

Factor a perfect square on the left side:
(x + 0.1290322581)(x + 0.1290322581) = 0.11342351718

Calculate the square root of the right side: 0.336784081

Break this problem into two subproblems by setting 
(x + 0.1290322581) equal to 0.336784081 and -0.336784081.

Subproblem 1

x + 0.1290322581 = 0.336784081 Simplifying x + 0.1290322581 = 0.336784081 Reorder the terms: 0.1290322581 + x = 0.336784081 Solving 0.1290322581 + x = 0.336784081 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.1290322581' to each side of the equation. 0.1290322581 + -0.1290322581 + x = 0.336784081 + -0.1290322581 Combine like terms: 0.1290322581 + -0.1290322581 = 0.0000000000 0.0000000000 + x = 0.336784081 + -0.1290322581 x = 0.336784081 + -0.1290322581 Combine like terms: 0.336784081 + -0.1290322581 = 0.2077518229 x = 0.2077518229 Simplifying x = 0.2077518229

Subproblem 2

x + 0.1290322581 = -0.336784081 Simplifying x + 0.1290322581 = -0.336784081 Reorder the terms: 0.1290322581 + x = -0.336784081 Solving 0.1290322581 + x = -0.336784081 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.1290322581' to each side of the equation. 0.1290322581 + -0.1290322581 + x = -0.336784081 + -0.1290322581 Combine like terms: 0.1290322581 + -0.1290322581 = 0.0000000000 0.0000000000 + x = -0.336784081 + -0.1290322581 x = -0.336784081 + -0.1290322581 Combine like terms: -0.336784081 + -0.1290322581 = -0.4658163391 x = -0.4658163391 Simplifying x = -0.4658163391

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.2077518229, -0.4658163391}

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