(2x+5)(x)=360

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


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

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

Reorder the terms for easier multiplication:
x(5 + 2x) = 360
(5 * x + 2x * x) = 360
(5x + 2x2) = 360

Solving
5x + 2x2 = 360

Solving for variable 'x'.

Reorder the terms:
-360 + 5x + 2x2 = 360 + -360

Combine like terms: 360 + -360 = 0
-360 + 5x + 2x2 = 0

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

Divide each side by '2'.
-180 + 2.5x + x2 = 0

Move the constant term to the right:

Add '180' to each side of the equation.
-180 + 2.5x + 180 + x2 = 0 + 180

Reorder the terms:
-180 + 180 + 2.5x + x2 = 0 + 180

Combine like terms: -180 + 180 = 0
0 + 2.5x + x2 = 0 + 180
2.5x + x2 = 0 + 180

Combine like terms: 0 + 180 = 180
2.5x + x2 = 180

The x term is 2.5x.  Take half its coefficient (1.25).
Square it (1.5625) and add it to both sides.

Add '1.5625' to each side of the equation.
2.5x + 1.5625 + x2 = 180 + 1.5625

Reorder the terms:
1.5625 + 2.5x + x2 = 180 + 1.5625

Combine like terms: 180 + 1.5625 = 181.5625
1.5625 + 2.5x + x2 = 181.5625

Factor a perfect square on the left side:
(x + 1.25)(x + 1.25) = 181.5625

Calculate the square root of the right side: 13.474512978

Break this problem into two subproblems by setting 
(x + 1.25) equal to 13.474512978 and -13.474512978.

Subproblem 1

x + 1.25 = 13.474512978 Simplifying x + 1.25 = 13.474512978 Reorder the terms: 1.25 + x = 13.474512978 Solving 1.25 + x = 13.474512978 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.25' to each side of the equation. 1.25 + -1.25 + x = 13.474512978 + -1.25 Combine like terms: 1.25 + -1.25 = 0.00 0.00 + x = 13.474512978 + -1.25 x = 13.474512978 + -1.25 Combine like terms: 13.474512978 + -1.25 = 12.224512978 x = 12.224512978 Simplifying x = 12.224512978

Subproblem 2

x + 1.25 = -13.474512978 Simplifying x + 1.25 = -13.474512978 Reorder the terms: 1.25 + x = -13.474512978 Solving 1.25 + x = -13.474512978 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.25' to each side of the equation. 1.25 + -1.25 + x = -13.474512978 + -1.25 Combine like terms: 1.25 + -1.25 = 0.00 0.00 + x = -13.474512978 + -1.25 x = -13.474512978 + -1.25 Combine like terms: -13.474512978 + -1.25 = -14.724512978 x = -14.724512978 Simplifying x = -14.724512978

Solution

The solution to the problem is based on the solutions from the subproblems. x = {12.224512978, -14.724512978}

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