4x^2+40x+16=0

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Solution for 4x^2+40x+16=0 equation: 


Simplifying
4x2 + 40x + 16 = 0

Reorder the terms:
16 + 40x + 4x2 = 0

Solving
16 + 40x + 4x2 = 0

Solving for variable 'x'.

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

Ignore the factor 4.

Subproblem 1
Set the factor '(4 + 10x + x2)' equal to zero and attempt to solve:

Simplifying
4 + 10x + x2 = 0

Solving
4 + 10x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-4' to each side of the equation.
4 + 10x + -4 + x2 = 0 + -4

Reorder the terms:
4 + -4 + 10x + x2 = 0 + -4

Combine like terms: 4 + -4 = 0
0 + 10x + x2 = 0 + -4
10x + x2 = 0 + -4

Combine like terms: 0 + -4 = -4
10x + x2 = -4

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 = -4 + 25

Reorder the terms:
25 + 10x + x2 = -4 + 25

Combine like terms: -4 + 25 = 21
25 + 10x + x2 = 21

Factor a perfect square on the left side:
(x + 5)(x + 5) = 21

Calculate the square root of the right side: 4.582575695

Break this problem into two subproblems by setting 
(x + 5) equal to 4.582575695 and -4.582575695.


Subproblem 1
x + 5 = 4.582575695

Simplifying
x + 5 = 4.582575695

Reorder the terms:
5 + x = 4.582575695

Solving
5 + x = 4.582575695

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 = 4.582575695 + -5

Combine like terms: 5 + -5 = 0
0 + x = 4.582575695 + -5
x = 4.582575695 + -5

Combine like terms: 4.582575695 + -5 = -0.417424305
x = -0.417424305

Simplifying
x = -0.417424305


Subproblem 2
x + 5 = -4.582575695

Simplifying
x + 5 = -4.582575695

Reorder the terms:
5 + x = -4.582575695

Solving
5 + x = -4.582575695

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 = -4.582575695 + -5

Combine like terms: 5 + -5 = 0
0 + x = -4.582575695 + -5
x = -4.582575695 + -5

Combine like terms: -4.582575695 + -5 = -9.582575695
x = -9.582575695

Simplifying
x = -9.582575695


Solution
The solution to the problem is based on the solutions
from the subproblems.
x = {-0.417424305, -9.582575695}
Solution
x = {-0.417424305, -9.582575695}

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