31x^2-26x-8=0

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Solution for 31x^2-26x-8=0 equation:


Simplifying
31x2 + -26x + -8 = 0

Reorder the terms:
-8 + -26x + 31x2 = 0

Solving
-8 + -26x + 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'.
-0.2580645161 + -0.8387096774x + x2 = 0

Move the constant term to the right:

Add '0.2580645161' to each side of the equation.
-0.2580645161 + -0.8387096774x + 0.2580645161 + x2 = 0 + 0.2580645161

Reorder the terms:
-0.2580645161 + 0.2580645161 + -0.8387096774x + x2 = 0 + 0.2580645161

Combine like terms: -0.2580645161 + 0.2580645161 = 0.0000000000
0.0000000000 + -0.8387096774x + x2 = 0 + 0.2580645161
-0.8387096774x + x2 = 0 + 0.2580645161

Combine like terms: 0 + 0.2580645161 = 0.2580645161
-0.8387096774x + x2 = 0.2580645161

The x term is -0.8387096774x.  Take half its coefficient (-0.4193548387).
Square it (0.1758584807) and add it to both sides.

Add '0.1758584807' to each side of the equation.
-0.8387096774x + 0.1758584807 + x2 = 0.2580645161 + 0.1758584807

Reorder the terms:
0.1758584807 + -0.8387096774x + x2 = 0.2580645161 + 0.1758584807

Combine like terms: 0.2580645161 + 0.1758584807 = 0.4339229968
0.1758584807 + -0.8387096774x + x2 = 0.4339229968

Factor a perfect square on the left side:
(x + -0.4193548387)(x + -0.4193548387) = 0.4339229968

Calculate the square root of the right side: 0.658728318

Break this problem into two subproblems by setting 
(x + -0.4193548387) equal to 0.658728318 and -0.658728318.

Subproblem 1

x + -0.4193548387 = 0.658728318 Simplifying x + -0.4193548387 = 0.658728318 Reorder the terms: -0.4193548387 + x = 0.658728318 Solving -0.4193548387 + x = 0.658728318 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.4193548387' to each side of the equation. -0.4193548387 + 0.4193548387 + x = 0.658728318 + 0.4193548387 Combine like terms: -0.4193548387 + 0.4193548387 = 0.0000000000 0.0000000000 + x = 0.658728318 + 0.4193548387 x = 0.658728318 + 0.4193548387 Combine like terms: 0.658728318 + 0.4193548387 = 1.0780831567 x = 1.0780831567 Simplifying x = 1.0780831567

Subproblem 2

x + -0.4193548387 = -0.658728318 Simplifying x + -0.4193548387 = -0.658728318 Reorder the terms: -0.4193548387 + x = -0.658728318 Solving -0.4193548387 + x = -0.658728318 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.4193548387' to each side of the equation. -0.4193548387 + 0.4193548387 + x = -0.658728318 + 0.4193548387 Combine like terms: -0.4193548387 + 0.4193548387 = 0.0000000000 0.0000000000 + x = -0.658728318 + 0.4193548387 x = -0.658728318 + 0.4193548387 Combine like terms: -0.658728318 + 0.4193548387 = -0.2393734793 x = -0.2393734793 Simplifying x = -0.2393734793

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.0780831567, -0.2393734793}

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