x^2-400x+1=0

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Solution for x^2-400x+1=0 equation:


Simplifying
x2 + -400x + 1 = 0

Reorder the terms:
1 + -400x + x2 = 0

Solving
1 + -400x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '-1' to each side of the equation.
1 + -400x + -1 + x2 = 0 + -1

Reorder the terms:
1 + -1 + -400x + x2 = 0 + -1

Combine like terms: 1 + -1 = 0
0 + -400x + x2 = 0 + -1
-400x + x2 = 0 + -1

Combine like terms: 0 + -1 = -1
-400x + x2 = -1

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 = -1 + 40000

Reorder the terms:
40000 + -400x + x2 = -1 + 40000

Combine like terms: -1 + 40000 = 39999
40000 + -400x + x2 = 39999

Factor a perfect square on the left side:
(x + -200)(x + -200) = 39999

Calculate the square root of the right side: 199.997499984

Break this problem into two subproblems by setting 
(x + -200) equal to 199.997499984 and -199.997499984.

Subproblem 1

x + -200 = 199.997499984 Simplifying x + -200 = 199.997499984 Reorder the terms: -200 + x = 199.997499984 Solving -200 + x = 199.997499984 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 = 199.997499984 + 200 Combine like terms: -200 + 200 = 0 0 + x = 199.997499984 + 200 x = 199.997499984 + 200 Combine like terms: 199.997499984 + 200 = 399.997499984 x = 399.997499984 Simplifying x = 399.997499984

Subproblem 2

x + -200 = -199.997499984 Simplifying x + -200 = -199.997499984 Reorder the terms: -200 + x = -199.997499984 Solving -200 + x = -199.997499984 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 = -199.997499984 + 200 Combine like terms: -200 + 200 = 0 0 + x = -199.997499984 + 200 x = -199.997499984 + 200 Combine like terms: -199.997499984 + 200 = 0.002500016 x = 0.002500016 Simplifying x = 0.002500016

Solution

The solution to the problem is based on the solutions from the subproblems. x = {399.997499984, 0.002500016}

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