x^2+4x-16=0

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


Simplifying
x2 + 4x + -16 = 0

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

Solving
-16 + 4x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '16' to each side of the equation.
-16 + 4x + 16 + x2 = 0 + 16

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

Combine like terms: -16 + 16 = 0
0 + 4x + x2 = 0 + 16
4x + x2 = 0 + 16

Combine like terms: 0 + 16 = 16
4x + x2 = 16

The x term is 4x.  Take half its coefficient (2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
4x + 4 + x2 = 16 + 4

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

Combine like terms: 16 + 4 = 20
4 + 4x + x2 = 20

Factor a perfect square on the left side:
(x + 2)(x + 2) = 20

Calculate the square root of the right side: 4.472135955

Break this problem into two subproblems by setting 
(x + 2) equal to 4.472135955 and -4.472135955.


Subproblem 1
x + 2 = 4.472135955

Simplifying
x + 2 = 4.472135955

Reorder the terms:
2 + x = 4.472135955

Solving
2 + x = 4.472135955

Solving for variable 'x'.

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

Add '-2' to each side of the equation.
2 + -2 + x = 4.472135955 + -2

Combine like terms: 2 + -2 = 0
0 + x = 4.472135955 + -2
x = 4.472135955 + -2

Combine like terms: 4.472135955 + -2 = 2.472135955
x = 2.472135955

Simplifying
x = 2.472135955


Subproblem 2
x + 2 = -4.472135955

Simplifying
x + 2 = -4.472135955

Reorder the terms:
2 + x = -4.472135955

Solving
2 + x = -4.472135955

Solving for variable 'x'.

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

Add '-2' to each side of the equation.
2 + -2 + x = -4.472135955 + -2

Combine like terms: 2 + -2 = 0
0 + x = -4.472135955 + -2
x = -4.472135955 + -2

Combine like terms: -4.472135955 + -2 = -6.472135955
x = -6.472135955

Simplifying
x = -6.472135955


Solution
The solution to the problem is based on the solutions
from the subproblems.
x = {2.472135955, -6.472135955}

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