x^2-400x+500=0

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Solution for x^2-400x+500=0 equation:


Simplifying
x2 + -400x + 500 = 0

Reorder the terms:
500 + -400x + x2 = 0

Solving
500 + -400x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '-500' to each side of the equation.
500 + -400x + -500 + x2 = 0 + -500

Reorder the terms:
500 + -500 + -400x + x2 = 0 + -500

Combine like terms: 500 + -500 = 0
0 + -400x + x2 = 0 + -500
-400x + x2 = 0 + -500

Combine like terms: 0 + -500 = -500
-400x + x2 = -500

The x term is -400x.  Take half its coefficient (-200).
Square it (40000) and add it to both sides.

Add '40000' to each side of the equation.
-400x + 40000 + x2 = -500 + 40000

Reorder the terms:
40000 + -400x + x2 = -500 + 40000

Combine like terms: -500 + 40000 = 39500
40000 + -400x + x2 = 39500

Factor a perfect square on the left side:
(x + -200)(x + -200) = 39500

Calculate the square root of the right side: 198.746069144

Break this problem into two subproblems by setting 
(x + -200) equal to 198.746069144 and -198.746069144.

Subproblem 1

x + -200 = 198.746069144 Simplifying x + -200 = 198.746069144 Reorder the terms: -200 + x = 198.746069144 Solving -200 + x = 198.746069144 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '200' to each side of the equation. -200 + 200 + x = 198.746069144 + 200 Combine like terms: -200 + 200 = 0 0 + x = 198.746069144 + 200 x = 198.746069144 + 200 Combine like terms: 198.746069144 + 200 = 398.746069144 x = 398.746069144 Simplifying x = 398.746069144

Subproblem 2

x + -200 = -198.746069144 Simplifying x + -200 = -198.746069144 Reorder the terms: -200 + x = -198.746069144 Solving -200 + x = -198.746069144 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '200' to each side of the equation. -200 + 200 + x = -198.746069144 + 200 Combine like terms: -200 + 200 = 0 0 + x = -198.746069144 + 200 x = -198.746069144 + 200 Combine like terms: -198.746069144 + 200 = 1.253930856 x = 1.253930856 Simplifying x = 1.253930856

Solution

The solution to the problem is based on the solutions from the subproblems. x = {398.746069144, 1.253930856}

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