15=(5)(x)(x+5)

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Solution for 15=(5)(x)(x+5) equation: 


Simplifying
15 = (5)(x)(x + 5)

Reorder the terms:
15 = 5x(5 + x)
15 = (5 * 5x + x * 5x)
15 = (25x + 5x2)

Solving
15 = 25x + 5x2

Solving for variable 'x'.

Reorder the terms:
15 + -25x + -5x2 = 25x + -25x + 5x2 + -5x2

Combine like terms: 25x + -25x = 0
15 + -25x + -5x2 = 0 + 5x2 + -5x2
15 + -25x + -5x2 = 5x2 + -5x2

Combine like terms: 5x2 + -5x2 = 0
15 + -25x + -5x2 = 0

Factor out the Greatest Common Factor (GCF), '5'.
5(3 + -5x + -1x2) = 0

Ignore the factor 5.

Subproblem 1
Set the factor '(3 + -5x + -1x2)' equal to zero and attempt to solve:

Simplifying
3 + -5x + -1x2 = 0

Solving
3 + -5x + -1x2 = 0

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

Divide each side by '-1'.
-3 + 5x + x2 = 0

Move the constant term to the right:

Add '3' to each side of the equation.
-3 + 5x + 3 + x2 = 0 + 3

Reorder the terms:
-3 + 3 + 5x + x2 = 0 + 3

Combine like terms: -3 + 3 = 0
0 + 5x + x2 = 0 + 3
5x + x2 = 0 + 3

Combine like terms: 0 + 3 = 3
5x + x2 = 3

The x term is 5x.  Take half its coefficient (2.5).
Square it (6.25) and add it to both sides.

Add '6.25' to each side of the equation.
5x + 6.25 + x2 = 3 + 6.25

Reorder the terms:
6.25 + 5x + x2 = 3 + 6.25

Combine like terms: 3 + 6.25 = 9.25
6.25 + 5x + x2 = 9.25

Factor a perfect square on the left side:
(x + 2.5)(x + 2.5) = 9.25

Calculate the square root of the right side: 3.041381265

Break this problem into two subproblems by setting 
(x + 2.5) equal to 3.041381265 and -3.041381265.


Subproblem 1
x + 2.5 = 3.041381265

Simplifying
x + 2.5 = 3.041381265

Reorder the terms:
2.5 + x = 3.041381265

Solving
2.5 + x = 3.041381265

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '-2.5' to each side of the equation.
2.5 + -2.5 + x = 3.041381265 + -2.5

Combine like terms: 2.5 + -2.5 = 0.0
0.0 + x = 3.041381265 + -2.5
x = 3.041381265 + -2.5

Combine like terms: 3.041381265 + -2.5 = 0.541381265
x = 0.541381265

Simplifying
x = 0.541381265


Subproblem 2
x + 2.5 = -3.041381265

Simplifying
x + 2.5 = -3.041381265

Reorder the terms:
2.5 + x = -3.041381265

Solving
2.5 + x = -3.041381265

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '-2.5' to each side of the equation.
2.5 + -2.5 + x = -3.041381265 + -2.5

Combine like terms: 2.5 + -2.5 = 0.0
0.0 + x = -3.041381265 + -2.5
x = -3.041381265 + -2.5

Combine like terms: -3.041381265 + -2.5 = -5.541381265
x = -5.541381265

Simplifying
x = -5.541381265


Solution
The solution to the problem is based on the solutions
from the subproblems.
x = {0.541381265, -5.541381265}
Solution
x = {0.541381265, -5.541381265}

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