2x(x+3)=x+3x+70

Solution for 2x(x+3)=x+3x+70 equation:

Simplifying
2x(x + 3) = x + 3x + 70

Reorder the terms:
2x(3 + x) = x + 3x + 70
(3 * 2x + x * 2x) = x + 3x + 70
(6x + 2x2) = x + 3x + 70

Reorder the terms:
6x + 2x2 = 70 + x + 3x

Combine like terms: x + 3x = 4x
6x + 2x2 = 70 + 4x

Solving
6x + 2x2 = 70 + 4x

Solving for variable 'x'.

Reorder the terms:
-70 + 6x + -4x + 2x2 = 70 + 4x + -70 + -4x

Combine like terms: 6x + -4x = 2x
-70 + 2x + 2x2 = 70 + 4x + -70 + -4x

Reorder the terms:
-70 + 2x + 2x2 = 70 + -70 + 4x + -4x

Combine like terms: 70 + -70 = 0
-70 + 2x + 2x2 = 0 + 4x + -4x
-70 + 2x + 2x2 = 4x + -4x

Combine like terms: 4x + -4x = 0
-70 + 2x + 2x2 = 0

Factor out the Greatest Common Factor (GCF), '2'.
2(-35 + x + x2) = 0

Ignore the factor 2.
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}