6x^2+3x+8x=9-11x+3x^2

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Solution for 6x^2+3x+8x=9-11x+3x^2 equation:


Simplifying
6x2 + 3x + 8x = 9 + -11x + 3x2

Reorder the terms:
3x + 8x + 6x2 = 9 + -11x + 3x2

Combine like terms: 3x + 8x = 11x
11x + 6x2 = 9 + -11x + 3x2

Solving
11x + 6x2 = 9 + -11x + 3x2

Solving for variable 'x'.

Reorder the terms:
-9 + 11x + 11x + 6x2 + -3x2 = 9 + -11x + 3x2 + -9 + 11x + -3x2

Combine like terms: 11x + 11x = 22x
-9 + 22x + 6x2 + -3x2 = 9 + -11x + 3x2 + -9 + 11x + -3x2

Combine like terms: 6x2 + -3x2 = 3x2
-9 + 22x + 3x2 = 9 + -11x + 3x2 + -9 + 11x + -3x2

Reorder the terms:
-9 + 22x + 3x2 = 9 + -9 + -11x + 11x + 3x2 + -3x2

Combine like terms: 9 + -9 = 0
-9 + 22x + 3x2 = 0 + -11x + 11x + 3x2 + -3x2
-9 + 22x + 3x2 = -11x + 11x + 3x2 + -3x2

Combine like terms: -11x + 11x = 0
-9 + 22x + 3x2 = 0 + 3x2 + -3x2
-9 + 22x + 3x2 = 3x2 + -3x2

Combine like terms: 3x2 + -3x2 = 0
-9 + 22x + 3x2 = 0

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

Divide each side by '3'.
-3 + 7.333333333x + x2 = 0

Move the constant term to the right:

Add '3' to each side of the equation.
-3 + 7.333333333x + 3 + x2 = 0 + 3

Reorder the terms:
-3 + 3 + 7.333333333x + x2 = 0 + 3

Combine like terms: -3 + 3 = 0
0 + 7.333333333x + x2 = 0 + 3
7.333333333x + x2 = 0 + 3

Combine like terms: 0 + 3 = 3
7.333333333x + x2 = 3

The x term is 7.333333333x.  Take half its coefficient (3.666666667).
Square it (13.44444445) and add it to both sides.

Add '13.44444445' to each side of the equation.
7.333333333x + 13.44444445 + x2 = 3 + 13.44444445

Reorder the terms:
13.44444445 + 7.333333333x + x2 = 3 + 13.44444445

Combine like terms: 3 + 13.44444445 = 16.44444445
13.44444445 + 7.333333333x + x2 = 16.44444445

Factor a perfect square on the left side:
(x + 3.666666667)(x + 3.666666667) = 16.44444445

Calculate the square root of the right side: 4.055175021

Break this problem into two subproblems by setting 
(x + 3.666666667) equal to 4.055175021 and -4.055175021.

Subproblem 1

x + 3.666666667 = 4.055175021 Simplifying x + 3.666666667 = 4.055175021 Reorder the terms: 3.666666667 + x = 4.055175021 Solving 3.666666667 + x = 4.055175021 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.666666667' to each side of the equation. 3.666666667 + -3.666666667 + x = 4.055175021 + -3.666666667 Combine like terms: 3.666666667 + -3.666666667 = 0.000000000 0.000000000 + x = 4.055175021 + -3.666666667 x = 4.055175021 + -3.666666667 Combine like terms: 4.055175021 + -3.666666667 = 0.388508354 x = 0.388508354 Simplifying x = 0.388508354

Subproblem 2

x + 3.666666667 = -4.055175021 Simplifying x + 3.666666667 = -4.055175021 Reorder the terms: 3.666666667 + x = -4.055175021 Solving 3.666666667 + x = -4.055175021 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.666666667' to each side of the equation. 3.666666667 + -3.666666667 + x = -4.055175021 + -3.666666667 Combine like terms: 3.666666667 + -3.666666667 = 0.000000000 0.000000000 + x = -4.055175021 + -3.666666667 x = -4.055175021 + -3.666666667 Combine like terms: -4.055175021 + -3.666666667 = -7.721841688 x = -7.721841688 Simplifying x = -7.721841688

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.388508354, -7.721841688}

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