13x^2+2x-68=0

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Solution for 13x^2+2x-68=0 equation:


Simplifying
13x2 + 2x + -68 = 0

Reorder the terms:
-68 + 2x + 13x2 = 0

Solving
-68 + 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'.
-5.230769231 + 0.1538461538x + x2 = 0

Move the constant term to the right:

Add '5.230769231' to each side of the equation.
-5.230769231 + 0.1538461538x + 5.230769231 + x2 = 0 + 5.230769231

Reorder the terms:
-5.230769231 + 5.230769231 + 0.1538461538x + x2 = 0 + 5.230769231

Combine like terms: -5.230769231 + 5.230769231 = 0.000000000
0.000000000 + 0.1538461538x + x2 = 0 + 5.230769231
0.1538461538x + x2 = 0 + 5.230769231

Combine like terms: 0 + 5.230769231 = 5.230769231
0.1538461538x + x2 = 5.230769231

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 = 5.230769231 + 0.005917159760

Reorder the terms:
0.005917159760 + 0.1538461538x + x2 = 5.230769231 + 0.005917159760

Combine like terms: 5.230769231 + 0.005917159760 = 5.23668639076
0.005917159760 + 0.1538461538x + x2 = 5.23668639076

Factor a perfect square on the left side:
(x + 0.0769230769)(x + 0.0769230769) = 5.23668639076

Calculate the square root of the right side: 2.288380736

Break this problem into two subproblems by setting 
(x + 0.0769230769) equal to 2.288380736 and -2.288380736.

Subproblem 1

x + 0.0769230769 = 2.288380736 Simplifying x + 0.0769230769 = 2.288380736 Reorder the terms: 0.0769230769 + x = 2.288380736 Solving 0.0769230769 + x = 2.288380736 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 = 2.288380736 + -0.0769230769 Combine like terms: 0.0769230769 + -0.0769230769 = 0.0000000000 0.0000000000 + x = 2.288380736 + -0.0769230769 x = 2.288380736 + -0.0769230769 Combine like terms: 2.288380736 + -0.0769230769 = 2.2114576591 x = 2.2114576591 Simplifying x = 2.2114576591

Subproblem 2

x + 0.0769230769 = -2.288380736 Simplifying x + 0.0769230769 = -2.288380736 Reorder the terms: 0.0769230769 + x = -2.288380736 Solving 0.0769230769 + x = -2.288380736 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 = -2.288380736 + -0.0769230769 Combine like terms: 0.0769230769 + -0.0769230769 = 0.0000000000 0.0000000000 + x = -2.288380736 + -0.0769230769 x = -2.288380736 + -0.0769230769 Combine like terms: -2.288380736 + -0.0769230769 = -2.3653038129 x = -2.3653038129 Simplifying x = -2.3653038129

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.2114576591, -2.3653038129}

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