13x^2+5x-8=6+x

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Solution for 13x^2+5x-8=6+x equation:


Simplifying
13x2 + 5x + -8 = 6 + x

Reorder the terms:
-8 + 5x + 13x2 = 6 + x

Solving
-8 + 5x + 13x2 = 6 + x

Solving for variable 'x'.

Reorder the terms:
-8 + -6 + 5x + -1x + 13x2 = 6 + x + -6 + -1x

Combine like terms: -8 + -6 = -14
-14 + 5x + -1x + 13x2 = 6 + x + -6 + -1x

Combine like terms: 5x + -1x = 4x
-14 + 4x + 13x2 = 6 + x + -6 + -1x

Reorder the terms:
-14 + 4x + 13x2 = 6 + -6 + x + -1x

Combine like terms: 6 + -6 = 0
-14 + 4x + 13x2 = 0 + x + -1x
-14 + 4x + 13x2 = x + -1x

Combine like terms: x + -1x = 0
-14 + 4x + 13x2 = 0

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

Divide each side by '13'.
-1.076923077 + 0.3076923077x + x2 = 0

Move the constant term to the right:

Add '1.076923077' to each side of the equation.
-1.076923077 + 0.3076923077x + 1.076923077 + x2 = 0 + 1.076923077

Reorder the terms:
-1.076923077 + 1.076923077 + 0.3076923077x + x2 = 0 + 1.076923077

Combine like terms: -1.076923077 + 1.076923077 = 0.000000000
0.000000000 + 0.3076923077x + x2 = 0 + 1.076923077
0.3076923077x + x2 = 0 + 1.076923077

Combine like terms: 0 + 1.076923077 = 1.076923077
0.3076923077x + x2 = 1.076923077

The x term is 0.3076923077x.  Take half its coefficient (0.1538461539).
Square it (0.02366863907) and add it to both sides.

Add '0.02366863907' to each side of the equation.
0.3076923077x + 0.02366863907 + x2 = 1.076923077 + 0.02366863907

Reorder the terms:
0.02366863907 + 0.3076923077x + x2 = 1.076923077 + 0.02366863907

Combine like terms: 1.076923077 + 0.02366863907 = 1.10059171607
0.02366863907 + 0.3076923077x + x2 = 1.10059171607

Factor a perfect square on the left side:
(x + 0.1538461539)(x + 0.1538461539) = 1.10059171607

Calculate the square root of the right side: 1.0490909

Break this problem into two subproblems by setting 
(x + 0.1538461539) equal to 1.0490909 and -1.0490909.

Subproblem 1

x + 0.1538461539 = 1.0490909 Simplifying x + 0.1538461539 = 1.0490909 Reorder the terms: 0.1538461539 + x = 1.0490909 Solving 0.1538461539 + x = 1.0490909 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.1538461539' to each side of the equation. 0.1538461539 + -0.1538461539 + x = 1.0490909 + -0.1538461539 Combine like terms: 0.1538461539 + -0.1538461539 = 0.0000000000 0.0000000000 + x = 1.0490909 + -0.1538461539 x = 1.0490909 + -0.1538461539 Combine like terms: 1.0490909 + -0.1538461539 = 0.8952447461 x = 0.8952447461 Simplifying x = 0.8952447461

Subproblem 2

x + 0.1538461539 = -1.0490909 Simplifying x + 0.1538461539 = -1.0490909 Reorder the terms: 0.1538461539 + x = -1.0490909 Solving 0.1538461539 + x = -1.0490909 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.1538461539' to each side of the equation. 0.1538461539 + -0.1538461539 + x = -1.0490909 + -0.1538461539 Combine like terms: 0.1538461539 + -0.1538461539 = 0.0000000000 0.0000000000 + x = -1.0490909 + -0.1538461539 x = -1.0490909 + -0.1538461539 Combine like terms: -1.0490909 + -0.1538461539 = -1.2029370539 x = -1.2029370539 Simplifying x = -1.2029370539

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.8952447461, -1.2029370539}

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