-1200=(800-100x)x

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Solution for -1200=(800-100x)x equation: 


Simplifying
-1200 = (800 + -100x) * x

Reorder the terms for easier multiplication:
-1200 = x(800 + -100x)
-1200 = (800 * x + -100x * x)
-1200 = (800x + -100x2)

Solving
-1200 = 800x + -100x2

Solving for variable 'x'.

Reorder the terms:
-1200 + -800x + 100x2 = 800x + -800x + -100x2 + 100x2

Combine like terms: 800x + -800x = 0
-1200 + -800x + 100x2 = 0 + -100x2 + 100x2
-1200 + -800x + 100x2 = -100x2 + 100x2

Combine like terms: -100x2 + 100x2 = 0
-1200 + -800x + 100x2 = 0

Factor out the Greatest Common Factor (GCF), '100'.
100(-12 + -8x + x2) = 0

Ignore the factor 100.

Subproblem 1
Set the factor '(-12 + -8x + x2)' equal to zero and attempt to solve:

Simplifying
-12 + -8x + x2 = 0

Solving
-12 + -8x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '12' to each side of the equation.
-12 + -8x + 12 + x2 = 0 + 12

Reorder the terms:
-12 + 12 + -8x + x2 = 0 + 12

Combine like terms: -12 + 12 = 0
0 + -8x + x2 = 0 + 12
-8x + x2 = 0 + 12

Combine like terms: 0 + 12 = 12
-8x + x2 = 12

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 = 12 + 16

Reorder the terms:
16 + -8x + x2 = 12 + 16

Combine like terms: 12 + 16 = 28
16 + -8x + x2 = 28

Factor a perfect square on the left side:
(x + -4)(x + -4) = 28

Calculate the square root of the right side: 5.291502622

Break this problem into two subproblems by setting 
(x + -4) equal to 5.291502622 and -5.291502622.


Subproblem 1
x + -4 = 5.291502622

Simplifying
x + -4 = 5.291502622

Reorder the terms:
-4 + x = 5.291502622

Solving
-4 + x = 5.291502622

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 = 5.291502622 + 4

Combine like terms: -4 + 4 = 0
0 + x = 5.291502622 + 4
x = 5.291502622 + 4

Combine like terms: 5.291502622 + 4 = 9.291502622
x = 9.291502622

Simplifying
x = 9.291502622


Subproblem 2
x + -4 = -5.291502622

Simplifying
x + -4 = -5.291502622

Reorder the terms:
-4 + x = -5.291502622

Solving
-4 + x = -5.291502622

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 = -5.291502622 + 4

Combine like terms: -4 + 4 = 0
0 + x = -5.291502622 + 4
x = -5.291502622 + 4

Combine like terms: -5.291502622 + 4 = -1.291502622
x = -1.291502622

Simplifying
x = -1.291502622


Solution
The solution to the problem is based on the solutions
from the subproblems.
x = {9.291502622, -1.291502622}
Solution
x = {9.291502622, -1.291502622}

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