360=x(x-3)+(x+8)+(x-5)

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Solution for 360=x(x-3)+(x+8)+(x-5) equation:


Simplifying
360 = x(x + -3) + (x + 8) + (x + -5)

Reorder the terms:
360 = x(-3 + x) + (x + 8) + (x + -5)
360 = (-3 * x + x * x) + (x + 8) + (x + -5)
360 = (-3x + x2) + (x + 8) + (x + -5)

Reorder the terms:
360 = -3x + x2 + (8 + x) + (x + -5)

Remove parenthesis around (8 + x)
360 = -3x + x2 + 8 + x + (x + -5)

Reorder the terms:
360 = -3x + x2 + 8 + x + (-5 + x)

Remove parenthesis around (-5 + x)
360 = -3x + x2 + 8 + x + -5 + x

Reorder the terms:
360 = 8 + -5 + -3x + x + x + x2

Combine like terms: 8 + -5 = 3
360 = 3 + -3x + x + x + x2

Combine like terms: -3x + x = -2x
360 = 3 + -2x + x + x2

Combine like terms: -2x + x = -1x
360 = 3 + -1x + x2

Solving
360 = 3 + -1x + x2

Solving for variable 'x'.

Combine like terms: 360 + -3 = 357
357 + x + -1x2 = 3 + -1x + x2 + -3 + x + -1x2

Reorder the terms:
357 + x + -1x2 = 3 + -3 + -1x + x + x2 + -1x2

Combine like terms: 3 + -3 = 0
357 + x + -1x2 = 0 + -1x + x + x2 + -1x2
357 + x + -1x2 = -1x + x + x2 + -1x2

Combine like terms: -1x + x = 0
357 + x + -1x2 = 0 + x2 + -1x2
357 + x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
357 + x + -1x2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-357 + -1x + x2 = 0

Move the constant term to the right:

Add '357' to each side of the equation.
-357 + -1x + 357 + x2 = 0 + 357

Reorder the terms:
-357 + 357 + -1x + x2 = 0 + 357

Combine like terms: -357 + 357 = 0
0 + -1x + x2 = 0 + 357
-1x + x2 = 0 + 357

Combine like terms: 0 + 357 = 357
-1x + x2 = 357

The x term is x.  Take half its coefficient (0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
-1x + 0.25 + x2 = 357 + 0.25

Reorder the terms:
0.25 + -1x + x2 = 357 + 0.25

Combine like terms: 357 + 0.25 = 357.25
0.25 + -1x + x2 = 357.25

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 357.25

Calculate the square root of the right side: 18.901058171

Break this problem into two subproblems by setting 
(x + 0.5) equal to 18.901058171 and -18.901058171.

Subproblem 1

x + 0.5 = 18.901058171 Simplifying x + 0.5 = 18.901058171 Reorder the terms: 0.5 + x = 18.901058171 Solving 0.5 + x = 18.901058171 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = 18.901058171 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 18.901058171 + -0.5 x = 18.901058171 + -0.5 Combine like terms: 18.901058171 + -0.5 = 18.401058171 x = 18.401058171 Simplifying x = 18.401058171

Subproblem 2

x + 0.5 = -18.901058171 Simplifying x + 0.5 = -18.901058171 Reorder the terms: 0.5 + x = -18.901058171 Solving 0.5 + x = -18.901058171 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = -18.901058171 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -18.901058171 + -0.5 x = -18.901058171 + -0.5 Combine like terms: -18.901058171 + -0.5 = -19.401058171 x = -19.401058171 Simplifying x = -19.401058171

Solution

The solution to the problem is based on the solutions from the subproblems. x = {18.401058171, -19.401058171}

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