1+13x+x^2=-5+-8x

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Solution for 1+13x+x^2=-5+-8x equation:


Simplifying
1 + 13x + x2 = -5 + -8x

Solving
1 + 13x + x2 = -5 + -8x

Solving for variable 'x'.

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

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

Combine like terms: 13x + 8x = 21x
6 + 21x + x2 = -5 + -8x + 5 + 8x

Reorder the terms:
6 + 21x + x2 = -5 + 5 + -8x + 8x

Combine like terms: -5 + 5 = 0
6 + 21x + x2 = 0 + -8x + 8x
6 + 21x + x2 = -8x + 8x

Combine like terms: -8x + 8x = 0
6 + 21x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-6' to each side of the equation.
6 + 21x + -6 + x2 = 0 + -6

Reorder the terms:
6 + -6 + 21x + x2 = 0 + -6

Combine like terms: 6 + -6 = 0
0 + 21x + x2 = 0 + -6
21x + x2 = 0 + -6

Combine like terms: 0 + -6 = -6
21x + x2 = -6

The x term is 21x.  Take half its coefficient (10.5).
Square it (110.25) and add it to both sides.

Add '110.25' to each side of the equation.
21x + 110.25 + x2 = -6 + 110.25

Reorder the terms:
110.25 + 21x + x2 = -6 + 110.25

Combine like terms: -6 + 110.25 = 104.25
110.25 + 21x + x2 = 104.25

Factor a perfect square on the left side:
(x + 10.5)(x + 10.5) = 104.25

Calculate the square root of the right side: 10.210288928

Break this problem into two subproblems by setting 
(x + 10.5) equal to 10.210288928 and -10.210288928.

Subproblem 1

x + 10.5 = 10.210288928 Simplifying x + 10.5 = 10.210288928 Reorder the terms: 10.5 + x = 10.210288928 Solving 10.5 + x = 10.210288928 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-10.5' to each side of the equation. 10.5 + -10.5 + x = 10.210288928 + -10.5 Combine like terms: 10.5 + -10.5 = 0.0 0.0 + x = 10.210288928 + -10.5 x = 10.210288928 + -10.5 Combine like terms: 10.210288928 + -10.5 = -0.289711072 x = -0.289711072 Simplifying x = -0.289711072

Subproblem 2

x + 10.5 = -10.210288928 Simplifying x + 10.5 = -10.210288928 Reorder the terms: 10.5 + x = -10.210288928 Solving 10.5 + x = -10.210288928 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-10.5' to each side of the equation. 10.5 + -10.5 + x = -10.210288928 + -10.5 Combine like terms: 10.5 + -10.5 = 0.0 0.0 + x = -10.210288928 + -10.5 x = -10.210288928 + -10.5 Combine like terms: -10.210288928 + -10.5 = -20.710288928 x = -20.710288928 Simplifying x = -20.710288928

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.289711072, -20.710288928}

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