x(x+4)=9

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Solution for x(x+4)=9 equation: 


Simplifying
x(x + 4) = 9

Reorder the terms:
x(4 + x) = 9
(4 * x + x * x) = 9
(4x + x2) = 9

Solving
4x + x2 = 9

Solving for variable 'x'.

Reorder the terms:
-9 + 4x + x2 = 9 + -9

Combine like terms: 9 + -9 = 0
-9 + 4x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '9' to each side of the equation.
-9 + 4x + 9 + x2 = 0 + 9

Reorder the terms:
-9 + 9 + 4x + x2 = 0 + 9

Combine like terms: -9 + 9 = 0
0 + 4x + x2 = 0 + 9
4x + x2 = 0 + 9

Combine like terms: 0 + 9 = 9
4x + x2 = 9

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 = 9 + 4

Reorder the terms:
4 + 4x + x2 = 9 + 4

Combine like terms: 9 + 4 = 13
4 + 4x + x2 = 13

Factor a perfect square on the left side:
(x + 2)(x + 2) = 13

Calculate the square root of the right side: 3.605551275

Break this problem into two subproblems by setting 
(x + 2) equal to 3.605551275 and -3.605551275.


Subproblem 1
x + 2 = 3.605551275

Simplifying
x + 2 = 3.605551275

Reorder the terms:
2 + x = 3.605551275

Solving
2 + x = 3.605551275

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 = 3.605551275 + -2

Combine like terms: 2 + -2 = 0
0 + x = 3.605551275 + -2
x = 3.605551275 + -2

Combine like terms: 3.605551275 + -2 = 1.605551275
x = 1.605551275

Simplifying
x = 1.605551275


Subproblem 2
x + 2 = -3.605551275

Simplifying
x + 2 = -3.605551275

Reorder the terms:
2 + x = -3.605551275

Solving
2 + x = -3.605551275

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 = -3.605551275 + -2

Combine like terms: 2 + -2 = 0
0 + x = -3.605551275 + -2
x = -3.605551275 + -2

Combine like terms: -3.605551275 + -2 = -5.605551275
x = -5.605551275

Simplifying
x = -5.605551275


Solution
The solution to the problem is based on the solutions
from the subproblems.
x = {1.605551275, -5.605551275}

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