2x(5x+40)=360

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Solution for 2x(5x+40)=360 equation: 


Simplifying
2x(5x + 40) = 360

Reorder the terms:
2x(40 + 5x) = 360
(40 * 2x + 5x * 2x) = 360
(80x + 10x2) = 360

Solving
80x + 10x2 = 360

Solving for variable 'x'.

Reorder the terms:
-360 + 80x + 10x2 = 360 + -360

Combine like terms: 360 + -360 = 0
-360 + 80x + 10x2 = 0

Factor out the Greatest Common Factor (GCF), '10'.
10(-36 + 8x + x2) = 0

Ignore the factor 10.

Subproblem 1
Set the factor '(-36 + 8x + x2)' equal to zero and attempt to solve:

Simplifying
-36 + 8x + x2 = 0

Solving
-36 + 8x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '36' to each side of the equation.
-36 + 8x + 36 + x2 = 0 + 36

Reorder the terms:
-36 + 36 + 8x + x2 = 0 + 36

Combine like terms: -36 + 36 = 0
0 + 8x + x2 = 0 + 36
8x + x2 = 0 + 36

Combine like terms: 0 + 36 = 36
8x + x2 = 36

The x term is 8x.  Take half its coefficient (4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
8x + 16 + x2 = 36 + 16

Reorder the terms:
16 + 8x + x2 = 36 + 16

Combine like terms: 36 + 16 = 52
16 + 8x + x2 = 52

Factor a perfect square on the left side:
(x + 4)(x + 4) = 52

Calculate the square root of the right side: 7.211102551

Break this problem into two subproblems by setting 
(x + 4) equal to 7.211102551 and -7.211102551.


Subproblem 1
x + 4 = 7.211102551

Simplifying
x + 4 = 7.211102551

Reorder the terms:
4 + x = 7.211102551

Solving
4 + x = 7.211102551

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '-4' to each side of the equation.
4 + -4 + x = 7.211102551 + -4

Combine like terms: 4 + -4 = 0
0 + x = 7.211102551 + -4
x = 7.211102551 + -4

Combine like terms: 7.211102551 + -4 = 3.211102551
x = 3.211102551

Simplifying
x = 3.211102551


Subproblem 2
x + 4 = -7.211102551

Simplifying
x + 4 = -7.211102551

Reorder the terms:
4 + x = -7.211102551

Solving
4 + x = -7.211102551

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '-4' to each side of the equation.
4 + -4 + x = -7.211102551 + -4

Combine like terms: 4 + -4 = 0
0 + x = -7.211102551 + -4
x = -7.211102551 + -4

Combine like terms: -7.211102551 + -4 = -11.211102551
x = -11.211102551

Simplifying
x = -11.211102551


Solution
The solution to the problem is based on the solutions
from the subproblems.
x = {3.211102551, -11.211102551}
Solution
x = {3.211102551, -11.211102551}

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