2x^2-6x-28=0

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


Simplifying
2x2 + -6x + -28 = 0

Reorder the terms:
-28 + -6x + 2x2 = 0

Solving
-28 + -6x + 2x2 = 0

Solving for variable 'x'.

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

Ignore the factor 2.

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

Simplifying
-14 + -3x + x2 = 0

Solving
-14 + -3x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '14' to each side of the equation.
-14 + -3x + 14 + x2 = 0 + 14

Reorder the terms:
-14 + 14 + -3x + x2 = 0 + 14

Combine like terms: -14 + 14 = 0
0 + -3x + x2 = 0 + 14
-3x + x2 = 0 + 14

Combine like terms: 0 + 14 = 14
-3x + x2 = 14

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 = 14 + 2.25

Reorder the terms:
2.25 + -3x + x2 = 14 + 2.25

Combine like terms: 14 + 2.25 = 16.25
2.25 + -3x + x2 = 16.25

Factor a perfect square on the left side:
(x + -1.5)(x + -1.5) = 16.25

Calculate the square root of the right side: 4.031128874

Break this problem into two subproblems by setting 
(x + -1.5) equal to 4.031128874 and -4.031128874.


Subproblem 1
x + -1.5 = 4.031128874

Simplifying
x + -1.5 = 4.031128874

Reorder the terms:
-1.5 + x = 4.031128874

Solving
-1.5 + x = 4.031128874

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 = 4.031128874 + 1.5

Combine like terms: -1.5 + 1.5 = 0.0
0.0 + x = 4.031128874 + 1.5
x = 4.031128874 + 1.5

Combine like terms: 4.031128874 + 1.5 = 5.531128874
x = 5.531128874

Simplifying
x = 5.531128874


Subproblem 2
x + -1.5 = -4.031128874

Simplifying
x + -1.5 = -4.031128874

Reorder the terms:
-1.5 + x = -4.031128874

Solving
-1.5 + x = -4.031128874

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 = -4.031128874 + 1.5

Combine like terms: -1.5 + 1.5 = 0.0
0.0 + x = -4.031128874 + 1.5
x = -4.031128874 + 1.5

Combine like terms: -4.031128874 + 1.5 = -2.531128874
x = -2.531128874

Simplifying
x = -2.531128874


Solution
The solution to the problem is based on the solutions
from the subproblems.
x = {5.531128874, -2.531128874}
Solution
x = {5.531128874, -2.531128874}

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