6x^2+13x-26=0

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Solution for 6x^2+13x-26=0 equation:


Simplifying
6x2 + 13x + -26 = 0

Reorder the terms:
-26 + 13x + 6x2 = 0

Solving
-26 + 13x + 6x2 = 0

Solving for variable 'x'.

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

Divide each side by '6'.
-4.333333333 + 2.166666667x + x2 = 0

Move the constant term to the right:

Add '4.333333333' to each side of the equation.
-4.333333333 + 2.166666667x + 4.333333333 + x2 = 0 + 4.333333333

Reorder the terms:
-4.333333333 + 4.333333333 + 2.166666667x + x2 = 0 + 4.333333333

Combine like terms: -4.333333333 + 4.333333333 = 0.000000000
0.000000000 + 2.166666667x + x2 = 0 + 4.333333333
2.166666667x + x2 = 0 + 4.333333333

Combine like terms: 0 + 4.333333333 = 4.333333333
2.166666667x + x2 = 4.333333333

The x term is 2.166666667x.  Take half its coefficient (1.083333334).
Square it (1.173611113) and add it to both sides.

Add '1.173611113' to each side of the equation.
2.166666667x + 1.173611113 + x2 = 4.333333333 + 1.173611113

Reorder the terms:
1.173611113 + 2.166666667x + x2 = 4.333333333 + 1.173611113

Combine like terms: 4.333333333 + 1.173611113 = 5.506944446
1.173611113 + 2.166666667x + x2 = 5.506944446

Factor a perfect square on the left side:
(x + 1.083333334)(x + 1.083333334) = 5.506944446

Calculate the square root of the right side: 2.346687974

Break this problem into two subproblems by setting 
(x + 1.083333334) equal to 2.346687974 and -2.346687974.

Subproblem 1

x + 1.083333334 = 2.346687974 Simplifying x + 1.083333334 = 2.346687974 Reorder the terms: 1.083333334 + x = 2.346687974 Solving 1.083333334 + x = 2.346687974 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.083333334' to each side of the equation. 1.083333334 + -1.083333334 + x = 2.346687974 + -1.083333334 Combine like terms: 1.083333334 + -1.083333334 = 0.000000000 0.000000000 + x = 2.346687974 + -1.083333334 x = 2.346687974 + -1.083333334 Combine like terms: 2.346687974 + -1.083333334 = 1.26335464 x = 1.26335464 Simplifying x = 1.26335464

Subproblem 2

x + 1.083333334 = -2.346687974 Simplifying x + 1.083333334 = -2.346687974 Reorder the terms: 1.083333334 + x = -2.346687974 Solving 1.083333334 + x = -2.346687974 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.083333334' to each side of the equation. 1.083333334 + -1.083333334 + x = -2.346687974 + -1.083333334 Combine like terms: 1.083333334 + -1.083333334 = 0.000000000 0.000000000 + x = -2.346687974 + -1.083333334 x = -2.346687974 + -1.083333334 Combine like terms: -2.346687974 + -1.083333334 = -3.430021308 x = -3.430021308 Simplifying x = -3.430021308

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.26335464, -3.430021308}

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