4*x^2+12*x-28=0

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Solution for 4*x^2+12*x-28=0 equation: 


Simplifying
4x2 + 12x + -28 = 0

Reorder the terms:
-28 + 12x + 4x2 = 0

Solving
-28 + 12x + 4x2 = 0

Solving for variable 'x'.

Factor out the Greatest Common Factor (GCF), '4'.
4(-7 + 3x + x2) = 0

Ignore the factor 4.

Subproblem 1
Set the factor '(-7 + 3x + x2)' equal to zero and attempt to solve:

Simplifying
-7 + 3x + x2 = 0

Solving
-7 + 3x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '7' to each side of the equation.
-7 + 3x + 7 + x2 = 0 + 7

Reorder the terms:
-7 + 7 + 3x + x2 = 0 + 7

Combine like terms: -7 + 7 = 0
0 + 3x + x2 = 0 + 7
3x + x2 = 0 + 7

Combine like terms: 0 + 7 = 7
3x + x2 = 7

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 = 7 + 2.25

Reorder the terms:
2.25 + 3x + x2 = 7 + 2.25

Combine like terms: 7 + 2.25 = 9.25
2.25 + 3x + x2 = 9.25

Factor a perfect square on the left side:
(x + 1.5)(x + 1.5) = 9.25

Calculate the square root of the right side: 3.041381265

Break this problem into two subproblems by setting 
(x + 1.5) equal to 3.041381265 and -3.041381265.


Subproblem 1
x + 1.5 = 3.041381265

Simplifying
x + 1.5 = 3.041381265

Reorder the terms:
1.5 + x = 3.041381265

Solving
1.5 + x = 3.041381265

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 = 3.041381265 + -1.5

Combine like terms: 1.5 + -1.5 = 0.0
0.0 + x = 3.041381265 + -1.5
x = 3.041381265 + -1.5

Combine like terms: 3.041381265 + -1.5 = 1.541381265
x = 1.541381265

Simplifying
x = 1.541381265


Subproblem 2
x + 1.5 = -3.041381265

Simplifying
x + 1.5 = -3.041381265

Reorder the terms:
1.5 + x = -3.041381265

Solving
1.5 + x = -3.041381265

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 = -3.041381265 + -1.5

Combine like terms: 1.5 + -1.5 = 0.0
0.0 + x = -3.041381265 + -1.5
x = -3.041381265 + -1.5

Combine like terms: -3.041381265 + -1.5 = -4.541381265
x = -4.541381265

Simplifying
x = -4.541381265


Solution
The solution to the problem is based on the solutions
from the subproblems.
x = {1.541381265, -4.541381265}
Solution
x = {1.541381265, -4.541381265}

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