x^2+20x-28=0

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Solution for x^2+20x-28=0 equation: 


Simplifying
x2 + 20x + -28 = 0

Reorder the terms:
-28 + 20x + x2 = 0

Solving
-28 + 20x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '28' to each side of the equation.
-28 + 20x + 28 + x2 = 0 + 28

Reorder the terms:
-28 + 28 + 20x + x2 = 0 + 28

Combine like terms: -28 + 28 = 0
0 + 20x + x2 = 0 + 28
20x + x2 = 0 + 28

Combine like terms: 0 + 28 = 28
20x + x2 = 28

The x term is 20x.  Take half its coefficient (10).
Square it (100) and add it to both sides.

Add '100' to each side of the equation.
20x + 100 + x2 = 28 + 100

Reorder the terms:
100 + 20x + x2 = 28 + 100

Combine like terms: 28 + 100 = 128
100 + 20x + x2 = 128

Factor a perfect square on the left side:
(x + 10)(x + 10) = 128

Calculate the square root of the right side: 11.313708499

Break this problem into two subproblems by setting 
(x + 10) equal to 11.313708499 and -11.313708499.


Subproblem 1
x + 10 = 11.313708499

Simplifying
x + 10 = 11.313708499

Reorder the terms:
10 + x = 11.313708499

Solving
10 + x = 11.313708499

Solving for variable 'x'.

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

Add '-10' to each side of the equation.
10 + -10 + x = 11.313708499 + -10

Combine like terms: 10 + -10 = 0
0 + x = 11.313708499 + -10
x = 11.313708499 + -10

Combine like terms: 11.313708499 + -10 = 1.313708499
x = 1.313708499

Simplifying
x = 1.313708499


Subproblem 2
x + 10 = -11.313708499

Simplifying
x + 10 = -11.313708499

Reorder the terms:
10 + x = -11.313708499

Solving
10 + x = -11.313708499

Solving for variable 'x'.

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

Add '-10' to each side of the equation.
10 + -10 + x = -11.313708499 + -10

Combine like terms: 10 + -10 = 0
0 + x = -11.313708499 + -10
x = -11.313708499 + -10

Combine like terms: -11.313708499 + -10 = -21.313708499
x = -21.313708499

Simplifying
x = -21.313708499


Solution
The solution to the problem is based on the solutions
from the subproblems.
x = {1.313708499, -21.313708499}

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