2x(x+5)=25

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Solution for 2x(x+5)=25 equation: 


Simplifying
2x(x + 5) = 25

Reorder the terms:
2x(5 + x) = 25
(5 * 2x + x * 2x) = 25
(10x + 2x2) = 25

Solving
10x + 2x2 = 25

Solving for variable 'x'.

Reorder the terms:
-25 + 10x + 2x2 = 25 + -25

Combine like terms: 25 + -25 = 0
-25 + 10x + 2x2 = 0

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

Divide each side by '2'.
-12.5 + 5x + x2 = 0

Move the constant term to the right:

Add '12.5' to each side of the equation.
-12.5 + 5x + 12.5 + x2 = 0 + 12.5

Reorder the terms:
-12.5 + 12.5 + 5x + x2 = 0 + 12.5

Combine like terms: -12.5 + 12.5 = 0.0
0.0 + 5x + x2 = 0 + 12.5
5x + x2 = 0 + 12.5

Combine like terms: 0 + 12.5 = 12.5
5x + x2 = 12.5

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 = 12.5 + 6.25

Reorder the terms:
6.25 + 5x + x2 = 12.5 + 6.25

Combine like terms: 12.5 + 6.25 = 18.75
6.25 + 5x + x2 = 18.75

Factor a perfect square on the left side:
(x + 2.5)(x + 2.5) = 18.75

Calculate the square root of the right side: 4.330127019

Break this problem into two subproblems by setting 
(x + 2.5) equal to 4.330127019 and -4.330127019.


Subproblem 1
x + 2.5 = 4.330127019

Simplifying
x + 2.5 = 4.330127019

Reorder the terms:
2.5 + x = 4.330127019

Solving
2.5 + x = 4.330127019

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 = 4.330127019 + -2.5

Combine like terms: 2.5 + -2.5 = 0.0
0.0 + x = 4.330127019 + -2.5
x = 4.330127019 + -2.5

Combine like terms: 4.330127019 + -2.5 = 1.830127019
x = 1.830127019

Simplifying
x = 1.830127019


Subproblem 2
x + 2.5 = -4.330127019

Simplifying
x + 2.5 = -4.330127019

Reorder the terms:
2.5 + x = -4.330127019

Solving
2.5 + x = -4.330127019

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 = -4.330127019 + -2.5

Combine like terms: 2.5 + -2.5 = 0.0
0.0 + x = -4.330127019 + -2.5
x = -4.330127019 + -2.5

Combine like terms: -4.330127019 + -2.5 = -6.830127019
x = -6.830127019

Simplifying
x = -6.830127019


Solution
The solution to the problem is based on the solutions
from the subproblems.
x = {1.830127019, -6.830127019}

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