2x(2x+2)=140

Solution for 2x(2x+2)=140 equation:

Simplifying
2x(2x + 2) = 140

Reorder the terms:
2x(2 + 2x) = 140
(2 * 2x + 2x * 2x) = 140
(4x + 4x2) = 140

Solving
4x + 4x2 = 140

Solving for variable 'x'.

Reorder the terms:
-140 + 4x + 4x2 = 140 + -140

Combine like terms: 140 + -140 = 0
-140 + 4x + 4x2 = 0

Factor out the Greatest Common Factor (GCF), '4'.
4(-35 + x + x2) = 0

Ignore the factor 4.
Subproblem 1
Set the factor '(-35 + x + x2)' equal to zero and attempt to solve:

Simplifying
-35 + x + x2 = 0

Solving
-35 + x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '35' to each side of the equation.
-35 + x + 35 + x2 = 0 + 35

Reorder the terms:
-35 + 35 + x + x2 = 0 + 35

Combine like terms: -35 + 35 = 0
0 + x + x2 = 0 + 35
x + x2 = 0 + 35

Combine like terms: 0 + 35 = 35
x + x2 = 35

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 = 35 + 0.25

Reorder the terms:
0.25 + x + x2 = 35 + 0.25

Combine like terms: 35 + 0.25 = 35.25
0.25 + x + x2 = 35.25

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 35.25

Calculate the square root of the right side: 5.937171044

Break this problem into two subproblems by setting 
(x + 0.5) equal to 5.937171044 and -5.937171044.

Subproblem 1
x + 0.5 = 5.937171044

Simplifying
x + 0.5 = 5.937171044

Reorder the terms:
0.5 + x = 5.937171044

Solving
0.5 + x = 5.937171044

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 = 5.937171044 + -0.5

Combine like terms: 0.5 + -0.5 = 0.0
0.0 + x = 5.937171044 + -0.5
x = 5.937171044 + -0.5

Combine like terms: 5.937171044 + -0.5 = 5.437171044
x = 5.437171044

Simplifying
x = 5.437171044

Subproblem 2
x + 0.5 = -5.937171044

Simplifying
x + 0.5 = -5.937171044

Reorder the terms:
0.5 + x = -5.937171044

Solving
0.5 + x = -5.937171044

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 = -5.937171044 + -0.5

Combine like terms: 0.5 + -0.5 = 0.0
0.0 + x = -5.937171044 + -0.5
x = -5.937171044 + -0.5

Combine like terms: -5.937171044 + -0.5 = -6.437171044
x = -6.437171044

Simplifying
x = -6.437171044

Solution
The solution to the problem is based on the solutions
from the subproblems.
x = {5.437171044, -6.437171044}
Solution
x = {5.437171044, -6.437171044}