3x(2x-20)-40=140

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Solution for 3x(2x-20)-40=140 equation: 


Simplifying
3x(2x + -20) + -40 = 140

Reorder the terms:
3x(-20 + 2x) + -40 = 140
(-20 * 3x + 2x * 3x) + -40 = 140
(-60x + 6x2) + -40 = 140

Reorder the terms:
-40 + -60x + 6x2 = 140

Solving
-40 + -60x + 6x2 = 140

Solving for variable 'x'.

Reorder the terms:
-40 + -140 + -60x + 6x2 = 140 + -140

Combine like terms: -40 + -140 = -180
-180 + -60x + 6x2 = 140 + -140

Combine like terms: 140 + -140 = 0
-180 + -60x + 6x2 = 0

Factor out the Greatest Common Factor (GCF), '6'.
6(-30 + -10x + x2) = 0

Ignore the factor 6.

Subproblem 1
Set the factor '(-30 + -10x + x2)' equal to zero and attempt to solve:

Simplifying
-30 + -10x + x2 = 0

Solving
-30 + -10x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '30' to each side of the equation.
-30 + -10x + 30 + x2 = 0 + 30

Reorder the terms:
-30 + 30 + -10x + x2 = 0 + 30

Combine like terms: -30 + 30 = 0
0 + -10x + x2 = 0 + 30
-10x + x2 = 0 + 30

Combine like terms: 0 + 30 = 30
-10x + x2 = 30

The x term is -10x.  Take half its coefficient (-5).
Square it (25) and add it to both sides.

Add '25' to each side of the equation.
-10x + 25 + x2 = 30 + 25

Reorder the terms:
25 + -10x + x2 = 30 + 25

Combine like terms: 30 + 25 = 55
25 + -10x + x2 = 55

Factor a perfect square on the left side:
(x + -5)(x + -5) = 55

Calculate the square root of the right side: 7.416198487

Break this problem into two subproblems by setting 
(x + -5) equal to 7.416198487 and -7.416198487.


Subproblem 1
x + -5 = 7.416198487

Simplifying
x + -5 = 7.416198487

Reorder the terms:
-5 + x = 7.416198487

Solving
-5 + x = 7.416198487

Solving for variable 'x'.

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

Add '5' to each side of the equation.
-5 + 5 + x = 7.416198487 + 5

Combine like terms: -5 + 5 = 0
0 + x = 7.416198487 + 5
x = 7.416198487 + 5

Combine like terms: 7.416198487 + 5 = 12.416198487
x = 12.416198487

Simplifying
x = 12.416198487


Subproblem 2
x + -5 = -7.416198487

Simplifying
x + -5 = -7.416198487

Reorder the terms:
-5 + x = -7.416198487

Solving
-5 + x = -7.416198487

Solving for variable 'x'.

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

Add '5' to each side of the equation.
-5 + 5 + x = -7.416198487 + 5

Combine like terms: -5 + 5 = 0
0 + x = -7.416198487 + 5
x = -7.416198487 + 5

Combine like terms: -7.416198487 + 5 = -2.416198487
x = -2.416198487

Simplifying
x = -2.416198487


Solution
The solution to the problem is based on the solutions
from the subproblems.
x = {12.416198487, -2.416198487}
Solution
x = {12.416198487, -2.416198487}

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