(2x+3)(2x+6)=5

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Solution for (2x+3)(2x+6)=5 equation:


Simplifying
(2x + 3)(2x + 6) = 5

Reorder the terms:
(3 + 2x)(2x + 6) = 5

Reorder the terms:
(3 + 2x)(6 + 2x) = 5

Multiply (3 + 2x) * (6 + 2x)
(3(6 + 2x) + 2x * (6 + 2x)) = 5
((6 * 3 + 2x * 3) + 2x * (6 + 2x)) = 5
((18 + 6x) + 2x * (6 + 2x)) = 5
(18 + 6x + (6 * 2x + 2x * 2x)) = 5
(18 + 6x + (12x + 4x2)) = 5

Combine like terms: 6x + 12x = 18x
(18 + 18x + 4x2) = 5

Solving
18 + 18x + 4x2 = 5

Solving for variable 'x'.

Reorder the terms:
18 + -5 + 18x + 4x2 = 5 + -5

Combine like terms: 18 + -5 = 13
13 + 18x + 4x2 = 5 + -5

Combine like terms: 5 + -5 = 0
13 + 18x + 4x2 = 0

Begin completing the square.  Divide all terms by
4 the coefficient of the squared term: 

Divide each side by '4'.
3.25 + 4.5x + x2 = 0

Move the constant term to the right:

Add '-3.25' to each side of the equation.
3.25 + 4.5x + -3.25 + x2 = 0 + -3.25

Reorder the terms:
3.25 + -3.25 + 4.5x + x2 = 0 + -3.25

Combine like terms: 3.25 + -3.25 = 0.00
0.00 + 4.5x + x2 = 0 + -3.25
4.5x + x2 = 0 + -3.25

Combine like terms: 0 + -3.25 = -3.25
4.5x + x2 = -3.25

The x term is 4.5x.  Take half its coefficient (2.25).
Square it (5.0625) and add it to both sides.

Add '5.0625' to each side of the equation.
4.5x + 5.0625 + x2 = -3.25 + 5.0625

Reorder the terms:
5.0625 + 4.5x + x2 = -3.25 + 5.0625

Combine like terms: -3.25 + 5.0625 = 1.8125
5.0625 + 4.5x + x2 = 1.8125

Factor a perfect square on the left side:
(x + 2.25)(x + 2.25) = 1.8125

Calculate the square root of the right side: 1.346291202

Break this problem into two subproblems by setting 
(x + 2.25) equal to 1.346291202 and -1.346291202.

Subproblem 1

x + 2.25 = 1.346291202 Simplifying x + 2.25 = 1.346291202 Reorder the terms: 2.25 + x = 1.346291202 Solving 2.25 + x = 1.346291202 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.25' to each side of the equation. 2.25 + -2.25 + x = 1.346291202 + -2.25 Combine like terms: 2.25 + -2.25 = 0.00 0.00 + x = 1.346291202 + -2.25 x = 1.346291202 + -2.25 Combine like terms: 1.346291202 + -2.25 = -0.903708798 x = -0.903708798 Simplifying x = -0.903708798

Subproblem 2

x + 2.25 = -1.346291202 Simplifying x + 2.25 = -1.346291202 Reorder the terms: 2.25 + x = -1.346291202 Solving 2.25 + x = -1.346291202 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.25' to each side of the equation. 2.25 + -2.25 + x = -1.346291202 + -2.25 Combine like terms: 2.25 + -2.25 = 0.00 0.00 + x = -1.346291202 + -2.25 x = -1.346291202 + -2.25 Combine like terms: -1.346291202 + -2.25 = -3.596291202 x = -3.596291202 Simplifying x = -3.596291202

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.903708798, -3.596291202}

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