(10x+5)(10x+5)=125

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Solution for (10x+5)(10x+5)=125 equation:


Simplifying
(10x + 5)(10x + 5) = 125

Reorder the terms:
(5 + 10x)(10x + 5) = 125

Reorder the terms:
(5 + 10x)(5 + 10x) = 125

Multiply (5 + 10x) * (5 + 10x)
(5(5 + 10x) + 10x * (5 + 10x)) = 125
((5 * 5 + 10x * 5) + 10x * (5 + 10x)) = 125
((25 + 50x) + 10x * (5 + 10x)) = 125
(25 + 50x + (5 * 10x + 10x * 10x)) = 125
(25 + 50x + (50x + 100x2)) = 125

Combine like terms: 50x + 50x = 100x
(25 + 100x + 100x2) = 125

Solving
25 + 100x + 100x2 = 125

Solving for variable 'x'.

Reorder the terms:
25 + -125 + 100x + 100x2 = 125 + -125

Combine like terms: 25 + -125 = -100
-100 + 100x + 100x2 = 125 + -125

Combine like terms: 125 + -125 = 0
-100 + 100x + 100x2 = 0

Factor out the Greatest Common Factor (GCF), '100'.
100(-1 + x + x2) = 0

Ignore the factor 100.

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

Simplifying
-1 + x + x2 = 0

Solving
-1 + x + x2 = 0

Begin completing the square.

Move the constant term to the right:

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

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

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

Combine like terms: 0 + 1 = 1
x + 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.
x + 0.25 + x2 = 1 + 0.25

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

Combine like terms: 1 + 0.25 = 1.25
0.25 + x + 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}

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