-13x^2+2x+6=0

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Solution for -13x^2+2x+6=0 equation:


Simplifying
-13x2 + 2x + 6 = 0

Reorder the terms:
6 + 2x + -13x2 = 0

Solving
6 + 2x + -13x2 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
-13 the coefficient of the squared term: 

Divide each side by '-13'.
-0.4615384615 + -0.1538461538x + x2 = 0

Move the constant term to the right:

Add '0.4615384615' to each side of the equation.
-0.4615384615 + -0.1538461538x + 0.4615384615 + x2 = 0 + 0.4615384615

Reorder the terms:
-0.4615384615 + 0.4615384615 + -0.1538461538x + x2 = 0 + 0.4615384615

Combine like terms: -0.4615384615 + 0.4615384615 = 0.0000000000
0.0000000000 + -0.1538461538x + x2 = 0 + 0.4615384615
-0.1538461538x + x2 = 0 + 0.4615384615

Combine like terms: 0 + 0.4615384615 = 0.4615384615
-0.1538461538x + x2 = 0.4615384615

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 = 0.4615384615 + 0.005917159760

Reorder the terms:
0.005917159760 + -0.1538461538x + x2 = 0.4615384615 + 0.005917159760

Combine like terms: 0.4615384615 + 0.005917159760 = 0.46745562126
0.005917159760 + -0.1538461538x + x2 = 0.46745562126

Factor a perfect square on the left side:
(x + -0.0769230769)(x + -0.0769230769) = 0.46745562126

Calculate the square root of the right side: 0.683707263

Break this problem into two subproblems by setting 
(x + -0.0769230769) equal to 0.683707263 and -0.683707263.

Subproblem 1

x + -0.0769230769 = 0.683707263 Simplifying x + -0.0769230769 = 0.683707263 Reorder the terms: -0.0769230769 + x = 0.683707263 Solving -0.0769230769 + x = 0.683707263 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 = 0.683707263 + 0.0769230769 Combine like terms: -0.0769230769 + 0.0769230769 = 0.0000000000 0.0000000000 + x = 0.683707263 + 0.0769230769 x = 0.683707263 + 0.0769230769 Combine like terms: 0.683707263 + 0.0769230769 = 0.7606303399 x = 0.7606303399 Simplifying x = 0.7606303399

Subproblem 2

x + -0.0769230769 = -0.683707263 Simplifying x + -0.0769230769 = -0.683707263 Reorder the terms: -0.0769230769 + x = -0.683707263 Solving -0.0769230769 + x = -0.683707263 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 = -0.683707263 + 0.0769230769 Combine like terms: -0.0769230769 + 0.0769230769 = 0.0000000000 0.0000000000 + x = -0.683707263 + 0.0769230769 x = -0.683707263 + 0.0769230769 Combine like terms: -0.683707263 + 0.0769230769 = -0.6067841861 x = -0.6067841861 Simplifying x = -0.6067841861

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.7606303399, -0.6067841861}

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