4x^2+40x-400=0

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Solution for 4x^2+40x-400=0 equation: 


Simplifying
4x2 + 40x + -400 = 0

Reorder the terms:
-400 + 40x + 4x2 = 0

Solving
-400 + 40x + 4x2 = 0

Solving for variable 'x'.

Factor out the Greatest Common Factor (GCF), '4'.
4(-100 + 10x + x2) = 0

Ignore the factor 4.

Subproblem 1
Set the factor '(-100 + 10x + x2)' equal to zero and attempt to solve:

Simplifying
-100 + 10x + x2 = 0

Solving
-100 + 10x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '100' to each side of the equation.
-100 + 10x + 100 + x2 = 0 + 100

Reorder the terms:
-100 + 100 + 10x + x2 = 0 + 100

Combine like terms: -100 + 100 = 0
0 + 10x + x2 = 0 + 100
10x + x2 = 0 + 100

Combine like terms: 0 + 100 = 100
10x + x2 = 100

The x term is 10x.  Take half its coefficient (5).
Square it (25) and add it to both sides.

Add '25' to each side of the equation.
10x + 25 + x2 = 100 + 25

Reorder the terms:
25 + 10x + x2 = 100 + 25

Combine like terms: 100 + 25 = 125
25 + 10x + x2 = 125

Factor a perfect square on the left side:
(x + 5)(x + 5) = 125

Calculate the square root of the right side: 11.180339887

Break this problem into two subproblems by setting 
(x + 5) equal to 11.180339887 and -11.180339887.


Subproblem 1
x + 5 = 11.180339887

Simplifying
x + 5 = 11.180339887

Reorder the terms:
5 + x = 11.180339887

Solving
5 + x = 11.180339887

Solving for variable 'x'.

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

Add '-5' to each side of the equation.
5 + -5 + x = 11.180339887 + -5

Combine like terms: 5 + -5 = 0
0 + x = 11.180339887 + -5
x = 11.180339887 + -5

Combine like terms: 11.180339887 + -5 = 6.180339887
x = 6.180339887

Simplifying
x = 6.180339887


Subproblem 2
x + 5 = -11.180339887

Simplifying
x + 5 = -11.180339887

Reorder the terms:
5 + x = -11.180339887

Solving
5 + x = -11.180339887

Solving for variable 'x'.

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

Add '-5' to each side of the equation.
5 + -5 + x = -11.180339887 + -5

Combine like terms: 5 + -5 = 0
0 + x = -11.180339887 + -5
x = -11.180339887 + -5

Combine like terms: -11.180339887 + -5 = -16.180339887
x = -16.180339887

Simplifying
x = -16.180339887


Solution
The solution to the problem is based on the solutions
from the subproblems.
x = {6.180339887, -16.180339887}
Solution
x = {6.180339887, -16.180339887}

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