(2x+5)(2x+1)=360

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Solution for (2x+5)(2x+1)=360 equation:


Simplifying
(2x + 5)(2x + 1) = 360

Reorder the terms:
(5 + 2x)(2x + 1) = 360

Reorder the terms:
(5 + 2x)(1 + 2x) = 360

Multiply (5 + 2x) * (1 + 2x)
(5(1 + 2x) + 2x * (1 + 2x)) = 360
((1 * 5 + 2x * 5) + 2x * (1 + 2x)) = 360
((5 + 10x) + 2x * (1 + 2x)) = 360
(5 + 10x + (1 * 2x + 2x * 2x)) = 360
(5 + 10x + (2x + 4x2)) = 360

Combine like terms: 10x + 2x = 12x
(5 + 12x + 4x2) = 360

Solving
5 + 12x + 4x2 = 360

Solving for variable 'x'.

Reorder the terms:
5 + -360 + 12x + 4x2 = 360 + -360

Combine like terms: 5 + -360 = -355
-355 + 12x + 4x2 = 360 + -360

Combine like terms: 360 + -360 = 0
-355 + 12x + 4x2 = 0

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

Divide each side by '4'.
-88.75 + 3x + x2 = 0

Move the constant term to the right:

Add '88.75' to each side of the equation.
-88.75 + 3x + 88.75 + x2 = 0 + 88.75

Reorder the terms:
-88.75 + 88.75 + 3x + x2 = 0 + 88.75

Combine like terms: -88.75 + 88.75 = 0.00
0.00 + 3x + x2 = 0 + 88.75
3x + x2 = 0 + 88.75

Combine like terms: 0 + 88.75 = 88.75
3x + x2 = 88.75

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 = 88.75 + 2.25

Reorder the terms:
2.25 + 3x + x2 = 88.75 + 2.25

Combine like terms: 88.75 + 2.25 = 91
2.25 + 3x + x2 = 91

Factor a perfect square on the left side:
(x + 1.5)(x + 1.5) = 91

Calculate the square root of the right side: 9.539392014

Break this problem into two subproblems by setting 
(x + 1.5) equal to 9.539392014 and -9.539392014.

Subproblem 1

x + 1.5 = 9.539392014 Simplifying x + 1.5 = 9.539392014 Reorder the terms: 1.5 + x = 9.539392014 Solving 1.5 + x = 9.539392014 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 = 9.539392014 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = 9.539392014 + -1.5 x = 9.539392014 + -1.5 Combine like terms: 9.539392014 + -1.5 = 8.039392014 x = 8.039392014 Simplifying x = 8.039392014

Subproblem 2

x + 1.5 = -9.539392014 Simplifying x + 1.5 = -9.539392014 Reorder the terms: 1.5 + x = -9.539392014 Solving 1.5 + x = -9.539392014 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 = -9.539392014 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = -9.539392014 + -1.5 x = -9.539392014 + -1.5 Combine like terms: -9.539392014 + -1.5 = -11.039392014 x = -11.039392014 Simplifying x = -11.039392014

Solution

The solution to the problem is based on the solutions from the subproblems. x = {8.039392014, -11.039392014}

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