5x(5x)+5x=25

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

Simplifying
5x(5x) + 5x = 25

Remove parenthesis around (5x)
5x * 5x + 5x = 25

Reorder the terms for easier multiplication:
5 * 5x * x + 5x = 25

Multiply 5 * 5
25x * x + 5x = 25

Multiply x * x
25x2 + 5x = 25

Reorder the terms:
5x + 25x2 = 25

Solving
5x + 25x2 = 25

Solving for variable 'x'.

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

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

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

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

Simplifying
-5 + x + 5x2 = 0

Solving
-5 + x + 5x2 = 0

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

Divide each side by '5'.
-1 + 0.2x + x2 = 0

Move the constant term to the right:

Add '1' to each side of the equation.
-1 + 0.2x + 1 + x2 = 0 + 1

Reorder the terms:
-1 + 1 + 0.2x + x2 = 0 + 1

Combine like terms: -1 + 1 = 0
0 + 0.2x + x2 = 0 + 1
0.2x + x2 = 0 + 1

Combine like terms: 0 + 1 = 1
0.2x + x2 = 1

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.
0.2x + 0.25 + x2 = 1 + 0.25

Reorder the terms:
0.25 + 0.2x + x2 = 1 + 0.25

Combine like terms: 1 + 0.25 = 1.25
0.25 + 0.2x + x2 = 1.25

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 1.25

Calculate the square root of the right side: 1.118033989

Break this problem into two subproblems by setting 
(x + 0.5) equal to 1.118033989 and -1.118033989.

Subproblem 1
x + 0.5 = 1.118033989

Simplifying
x + 0.5 = 1.118033989

Reorder the terms:
0.5 + x = 1.118033989

Solving
0.5 + x = 1.118033989

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 = 1.118033989 + -0.5

Combine like terms: 0.5 + -0.5 = 0.0
0.0 + x = 1.118033989 + -0.5
x = 1.118033989 + -0.5

Combine like terms: 1.118033989 + -0.5 = 0.618033989
x = 0.618033989

Simplifying
x = 0.618033989

Subproblem 2
x + 0.5 = -1.118033989

Simplifying
x + 0.5 = -1.118033989

Reorder the terms:
0.5 + x = -1.118033989

Solving
0.5 + x = -1.118033989

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 = -1.118033989 + -0.5

Combine like terms: 0.5 + -0.5 = 0.0
0.0 + x = -1.118033989 + -0.5
x = -1.118033989 + -0.5

Combine like terms: -1.118033989 + -0.5 = -1.618033989
x = -1.618033989

Simplifying
x = -1.618033989

Solution
The solution to the problem is based on the solutions
from the subproblems.
x = {0.618033989, -1.618033989}
Solution
x = {0.618033989, -1.618033989}