x=3x^2+4x-8

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Solution for x=3x^2+4x-8 equation: 


Simplifying
x = 3x2 + 4x + -8

Reorder the terms:
x = -8 + 4x + 3x2

Solving
x = -8 + 4x + 3x2

Solving for variable 'x'.

Reorder the terms:
8 + x + -4x + -3x2 = -8 + 4x + 3x2 + 8 + -4x + -3x2

Combine like terms: x + -4x = -3x
8 + -3x + -3x2 = -8 + 4x + 3x2 + 8 + -4x + -3x2

Reorder the terms:
8 + -3x + -3x2 = -8 + 8 + 4x + -4x + 3x2 + -3x2

Combine like terms: -8 + 8 = 0
8 + -3x + -3x2 = 0 + 4x + -4x + 3x2 + -3x2
8 + -3x + -3x2 = 4x + -4x + 3x2 + -3x2

Combine like terms: 4x + -4x = 0
8 + -3x + -3x2 = 0 + 3x2 + -3x2
8 + -3x + -3x2 = 3x2 + -3x2

Combine like terms: 3x2 + -3x2 = 0
8 + -3x + -3x2 = 0

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

Divide each side by '-3'.
-2.666666667 + x + x2 = 0

Move the constant term to the right:

Add '2.666666667' to each side of the equation.
-2.666666667 + x + 2.666666667 + x2 = 0 + 2.666666667

Reorder the terms:
-2.666666667 + 2.666666667 + x + x2 = 0 + 2.666666667

Combine like terms: -2.666666667 + 2.666666667 = 0.000000000
0.000000000 + x + x2 = 0 + 2.666666667
x + x2 = 0 + 2.666666667

Combine like terms: 0 + 2.666666667 = 2.666666667
x + x2 = 2.666666667

The x term is x.  Take half its coefficient (0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
 + 0.25 + x2 = 2.666666667 + 0.25

Combine like terms:  + 0.25 = 1.25
1.25 + x2 = 2.666666667 + 0.25

Combine like terms: 2.666666667 + 0.25 = 2.916666667
1.25 + x2 = 2.916666667

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 2.916666667

Calculate the square root of the right side: 1.707825128

Break this problem into two subproblems by setting 
(x + 0.5) equal to 1.707825128 and -1.707825128.


Subproblem 1
x + 0.5 = 1.707825128

Simplifying
x + 0.5 = 1.707825128

Reorder the terms:
0.5 + x = 1.707825128

Solving
0.5 + x = 1.707825128

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '-0.5' to each side of the equation.
0.5 + -0.5 + x = 1.707825128 + -0.5

Combine like terms: 0.5 + -0.5 = 0.0
0.0 + x = 1.707825128 + -0.5
x = 1.707825128 + -0.5

Combine like terms: 1.707825128 + -0.5 = 1.207825128
x = 1.207825128

Simplifying
x = 1.207825128


Subproblem 2
x + 0.5 = -1.707825128

Simplifying
x + 0.5 = -1.707825128

Reorder the terms:
0.5 + x = -1.707825128

Solving
0.5 + x = -1.707825128

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '-0.5' to each side of the equation.
0.5 + -0.5 + x = -1.707825128 + -0.5

Combine like terms: 0.5 + -0.5 = 0.0
0.0 + x = -1.707825128 + -0.5
x = -1.707825128 + -0.5

Combine like terms: -1.707825128 + -0.5 = -2.207825128
x = -2.207825128

Simplifying
x = -2.207825128


Solution
The solution to the problem is based on the solutions
from the subproblems.
x = {1.207825128, -2.207825128}

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