x^2-200x+800=0

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Solution for x^2-200x+800=0 equation:


Simplifying
x2 + -200x + 800 = 0

Reorder the terms:
800 + -200x + x2 = 0

Solving
800 + -200x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '-800' to each side of the equation.
800 + -200x + -800 + x2 = 0 + -800

Reorder the terms:
800 + -800 + -200x + x2 = 0 + -800

Combine like terms: 800 + -800 = 0
0 + -200x + x2 = 0 + -800
-200x + x2 = 0 + -800

Combine like terms: 0 + -800 = -800
-200x + x2 = -800

The x term is -200x.  Take half its coefficient (-100).
Square it (10000) and add it to both sides.

Add '10000' to each side of the equation.
-200x + 10000 + x2 = -800 + 10000

Reorder the terms:
10000 + -200x + x2 = -800 + 10000

Combine like terms: -800 + 10000 = 9200
10000 + -200x + x2 = 9200

Factor a perfect square on the left side:
(x + -100)(x + -100) = 9200

Calculate the square root of the right side: 95.916630466

Break this problem into two subproblems by setting 
(x + -100) equal to 95.916630466 and -95.916630466.

Subproblem 1

x + -100 = 95.916630466 Simplifying x + -100 = 95.916630466 Reorder the terms: -100 + x = 95.916630466 Solving -100 + x = 95.916630466 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '100' to each side of the equation. -100 + 100 + x = 95.916630466 + 100 Combine like terms: -100 + 100 = 0 0 + x = 95.916630466 + 100 x = 95.916630466 + 100 Combine like terms: 95.916630466 + 100 = 195.916630466 x = 195.916630466 Simplifying x = 195.916630466

Subproblem 2

x + -100 = -95.916630466 Simplifying x + -100 = -95.916630466 Reorder the terms: -100 + x = -95.916630466 Solving -100 + x = -95.916630466 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '100' to each side of the equation. -100 + 100 + x = -95.916630466 + 100 Combine like terms: -100 + 100 = 0 0 + x = -95.916630466 + 100 x = -95.916630466 + 100 Combine like terms: -95.916630466 + 100 = 4.083369534 x = 4.083369534 Simplifying x = 4.083369534

Solution

The solution to the problem is based on the solutions from the subproblems. x = {195.916630466, 4.083369534}

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