169x^2+26x-1=0

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Solution for 169x^2+26x-1=0 equation:


Simplifying
169x2 + 26x + -1 = 0

Reorder the terms:
-1 + 26x + 169x2 = 0

Solving
-1 + 26x + 169x2 = 0

Solving for variable 'x'.

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

Divide each side by '169'.
-0.005917159763 + 0.1538461538x + x2 = 0

Move the constant term to the right:

Add '0.005917159763' to each side of the equation.
-0.005917159763 + 0.1538461538x + 0.005917159763 + x2 = 0 + 0.005917159763

Reorder the terms:
-0.005917159763 + 0.005917159763 + 0.1538461538x + x2 = 0 + 0.005917159763

Combine like terms: -0.005917159763 + 0.005917159763 = 0.000000000000
0.000000000000 + 0.1538461538x + x2 = 0 + 0.005917159763
0.1538461538x + x2 = 0 + 0.005917159763

Combine like terms: 0 + 0.005917159763 = 0.005917159763
0.1538461538x + x2 = 0.005917159763

The x term is 0.1538461538x.  Take half its coefficient (0.0769230769).
Square it (0.005917159760) and add it to both sides.

Add '0.005917159760' to each side of the equation.
0.1538461538x + 0.005917159760 + x2 = 0.005917159763 + 0.005917159760

Reorder the terms:
0.005917159760 + 0.1538461538x + x2 = 0.005917159763 + 0.005917159760

Combine like terms: 0.005917159763 + 0.005917159760 = 0.011834319523
0.005917159760 + 0.1538461538x + x2 = 0.011834319523

Factor a perfect square on the left side:
(x + 0.0769230769)(x + 0.0769230769) = 0.011834319523

Calculate the square root of the right side: 0.108785659

Break this problem into two subproblems by setting 
(x + 0.0769230769) equal to 0.108785659 and -0.108785659.

Subproblem 1

x + 0.0769230769 = 0.108785659 Simplifying x + 0.0769230769 = 0.108785659 Reorder the terms: 0.0769230769 + x = 0.108785659 Solving 0.0769230769 + x = 0.108785659 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.0769230769' to each side of the equation. 0.0769230769 + -0.0769230769 + x = 0.108785659 + -0.0769230769 Combine like terms: 0.0769230769 + -0.0769230769 = 0.0000000000 0.0000000000 + x = 0.108785659 + -0.0769230769 x = 0.108785659 + -0.0769230769 Combine like terms: 0.108785659 + -0.0769230769 = 0.0318625821 x = 0.0318625821 Simplifying x = 0.0318625821

Subproblem 2

x + 0.0769230769 = -0.108785659 Simplifying x + 0.0769230769 = -0.108785659 Reorder the terms: 0.0769230769 + x = -0.108785659 Solving 0.0769230769 + x = -0.108785659 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.0769230769' to each side of the equation. 0.0769230769 + -0.0769230769 + x = -0.108785659 + -0.0769230769 Combine like terms: 0.0769230769 + -0.0769230769 = 0.0000000000 0.0000000000 + x = -0.108785659 + -0.0769230769 x = -0.108785659 + -0.0769230769 Combine like terms: -0.108785659 + -0.0769230769 = -0.1857087359 x = -0.1857087359 Simplifying x = -0.1857087359

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.0318625821, -0.1857087359}

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