6x^2+18x-28=0

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Solution for 6x^2+18x-28=0 equation: 


Simplifying
6x2 + 18x + -28 = 0

Reorder the terms:
-28 + 18x + 6x2 = 0

Solving
-28 + 18x + 6x2 = 0

Solving for variable 'x'.

Factor out the Greatest Common Factor (GCF), '2'.
2(-14 + 9x + 3x2) = 0

Ignore the factor 2.

Subproblem 1
Set the factor '(-14 + 9x + 3x2)' equal to zero and attempt to solve:

Simplifying
-14 + 9x + 3x2 = 0

Solving
-14 + 9x + 3x2 = 0

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

Divide each side by '3'.
-4.666666667 + 3x + x2 = 0

Move the constant term to the right:

Add '4.666666667' to each side of the equation.
-4.666666667 + 3x + 4.666666667 + x2 = 0 + 4.666666667

Reorder the terms:
-4.666666667 + 4.666666667 + 3x + x2 = 0 + 4.666666667

Combine like terms: -4.666666667 + 4.666666667 = 0.000000000
0.000000000 + 3x + x2 = 0 + 4.666666667
3x + x2 = 0 + 4.666666667

Combine like terms: 0 + 4.666666667 = 4.666666667
3x + x2 = 4.666666667

The x term is 3x.  Take half its coefficient (1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
3x + 2.25 + x2 = 4.666666667 + 2.25

Reorder the terms:
2.25 + 3x + x2 = 4.666666667 + 2.25

Combine like terms: 4.666666667 + 2.25 = 6.916666667
2.25 + 3x + x2 = 6.916666667

Factor a perfect square on the left side:
(x + 1.5)(x + 1.5) = 6.916666667

Calculate the square root of the right side: 2.62995564

Break this problem into two subproblems by setting 
(x + 1.5) equal to 2.62995564 and -2.62995564.


Subproblem 1
x + 1.5 = 2.62995564

Simplifying
x + 1.5 = 2.62995564

Reorder the terms:
1.5 + x = 2.62995564

Solving
1.5 + x = 2.62995564

Solving for variable 'x'.

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

Add '-1.5' to each side of the equation.
1.5 + -1.5 + x = 2.62995564 + -1.5

Combine like terms: 1.5 + -1.5 = 0.0
0.0 + x = 2.62995564 + -1.5
x = 2.62995564 + -1.5

Combine like terms: 2.62995564 + -1.5 = 1.12995564
x = 1.12995564

Simplifying
x = 1.12995564


Subproblem 2
x + 1.5 = -2.62995564

Simplifying
x + 1.5 = -2.62995564

Reorder the terms:
1.5 + x = -2.62995564

Solving
1.5 + x = -2.62995564

Solving for variable 'x'.

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

Add '-1.5' to each side of the equation.
1.5 + -1.5 + x = -2.62995564 + -1.5

Combine like terms: 1.5 + -1.5 = 0.0
0.0 + x = -2.62995564 + -1.5
x = -2.62995564 + -1.5

Combine like terms: -2.62995564 + -1.5 = -4.12995564
x = -4.12995564

Simplifying
x = -4.12995564


Solution
The solution to the problem is based on the solutions
from the subproblems.
x = {1.12995564, -4.12995564}
Solution
x = {1.12995564, -4.12995564}

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