x(x+2)+(x+4)=36

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Solution for x(x+2)+(x+4)=36 equation:


Simplifying
x(x + 2) + (x + 4) = 36

Reorder the terms:
x(2 + x) + (x + 4) = 36
(2 * x + x * x) + (x + 4) = 36
(2x + x2) + (x + 4) = 36

Reorder the terms:
2x + x2 + (4 + x) = 36

Remove parenthesis around (4 + x)
2x + x2 + 4 + x = 36

Reorder the terms:
4 + 2x + x + x2 = 36

Combine like terms: 2x + x = 3x
4 + 3x + x2 = 36

Solving
4 + 3x + x2 = 36

Solving for variable 'x'.

Reorder the terms:
4 + -36 + 3x + x2 = 36 + -36

Combine like terms: 4 + -36 = -32
-32 + 3x + x2 = 36 + -36

Combine like terms: 36 + -36 = 0
-32 + 3x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '32' to each side of the equation.
-32 + 3x + 32 + x2 = 0 + 32

Reorder the terms:
-32 + 32 + 3x + x2 = 0 + 32

Combine like terms: -32 + 32 = 0
0 + 3x + x2 = 0 + 32
3x + x2 = 0 + 32

Combine like terms: 0 + 32 = 32
3x + x2 = 32

The x term is 3x.  Take half its coefficient (1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
3x + 2.25 + x2 = 32 + 2.25

Reorder the terms:
2.25 + 3x + x2 = 32 + 2.25

Combine like terms: 32 + 2.25 = 34.25
2.25 + 3x + x2 = 34.25

Factor a perfect square on the left side:
(x + 1.5)(x + 1.5) = 34.25

Calculate the square root of the right side: 5.852349955

Break this problem into two subproblems by setting 
(x + 1.5) equal to 5.852349955 and -5.852349955.

Subproblem 1

x + 1.5 = 5.852349955 Simplifying x + 1.5 = 5.852349955 Reorder the terms: 1.5 + x = 5.852349955 Solving 1.5 + x = 5.852349955 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.5' to each side of the equation. 1.5 + -1.5 + x = 5.852349955 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = 5.852349955 + -1.5 x = 5.852349955 + -1.5 Combine like terms: 5.852349955 + -1.5 = 4.352349955 x = 4.352349955 Simplifying x = 4.352349955

Subproblem 2

x + 1.5 = -5.852349955 Simplifying x + 1.5 = -5.852349955 Reorder the terms: 1.5 + x = -5.852349955 Solving 1.5 + x = -5.852349955 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.5' to each side of the equation. 1.5 + -1.5 + x = -5.852349955 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = -5.852349955 + -1.5 x = -5.852349955 + -1.5 Combine like terms: -5.852349955 + -1.5 = -7.352349955 x = -7.352349955 Simplifying x = -7.352349955

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.352349955, -7.352349955}

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