5x^2+6x^2+6x=123

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Solution for 5x^2+6x^2+6x=123 equation:


Simplifying
5x2 + 6x2 + 6x = 123

Reorder the terms:
6x + 5x2 + 6x2 = 123

Combine like terms: 5x2 + 6x2 = 11x2
6x + 11x2 = 123

Solving
6x + 11x2 = 123

Solving for variable 'x'.

Reorder the terms:
-123 + 6x + 11x2 = 123 + -123

Combine like terms: 123 + -123 = 0
-123 + 6x + 11x2 = 0

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

Divide each side by '11'.
-11.18181818 + 0.5454545455x + x2 = 0

Move the constant term to the right:

Add '11.18181818' to each side of the equation.
-11.18181818 + 0.5454545455x + 11.18181818 + x2 = 0 + 11.18181818

Reorder the terms:
-11.18181818 + 11.18181818 + 0.5454545455x + x2 = 0 + 11.18181818

Combine like terms: -11.18181818 + 11.18181818 = 0.00000000
0.00000000 + 0.5454545455x + x2 = 0 + 11.18181818
0.5454545455x + x2 = 0 + 11.18181818

Combine like terms: 0 + 11.18181818 = 11.18181818
0.5454545455x + x2 = 11.18181818

The x term is 0.5454545455x.  Take half its coefficient (0.2727272728).
Square it (0.07438016533) and add it to both sides.

Add '0.07438016533' to each side of the equation.
0.5454545455x + 0.07438016533 + x2 = 11.18181818 + 0.07438016533

Reorder the terms:
0.07438016533 + 0.5454545455x + x2 = 11.18181818 + 0.07438016533

Combine like terms: 11.18181818 + 0.07438016533 = 11.25619834533
0.07438016533 + 0.5454545455x + x2 = 11.25619834533

Factor a perfect square on the left side:
(x + 0.2727272728)(x + 0.2727272728) = 11.25619834533

Calculate the square root of the right side: 3.355025834

Break this problem into two subproblems by setting 
(x + 0.2727272728) equal to 3.355025834 and -3.355025834.

Subproblem 1

x + 0.2727272728 = 3.355025834 Simplifying x + 0.2727272728 = 3.355025834 Reorder the terms: 0.2727272728 + x = 3.355025834 Solving 0.2727272728 + x = 3.355025834 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.2727272728' to each side of the equation. 0.2727272728 + -0.2727272728 + x = 3.355025834 + -0.2727272728 Combine like terms: 0.2727272728 + -0.2727272728 = 0.0000000000 0.0000000000 + x = 3.355025834 + -0.2727272728 x = 3.355025834 + -0.2727272728 Combine like terms: 3.355025834 + -0.2727272728 = 3.0822985612 x = 3.0822985612 Simplifying x = 3.0822985612

Subproblem 2

x + 0.2727272728 = -3.355025834 Simplifying x + 0.2727272728 = -3.355025834 Reorder the terms: 0.2727272728 + x = -3.355025834 Solving 0.2727272728 + x = -3.355025834 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.2727272728' to each side of the equation. 0.2727272728 + -0.2727272728 + x = -3.355025834 + -0.2727272728 Combine like terms: 0.2727272728 + -0.2727272728 = 0.0000000000 0.0000000000 + x = -3.355025834 + -0.2727272728 x = -3.355025834 + -0.2727272728 Combine like terms: -3.355025834 + -0.2727272728 = -3.6277531068 x = -3.6277531068 Simplifying x = -3.6277531068

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.0822985612, -3.6277531068}

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