x^2-x-200=0

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


Simplifying
x2 + -1x + -200 = 0

Reorder the terms:
-200 + -1x + x2 = 0

Solving
-200 + -1x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '200' to each side of the equation.
-200 + -1x + 200 + x2 = 0 + 200

Reorder the terms:
-200 + 200 + -1x + x2 = 0 + 200

Combine like terms: -200 + 200 = 0
0 + -1x + x2 = 0 + 200
-1x + x2 = 0 + 200

Combine like terms: 0 + 200 = 200
-1x + x2 = 200

The x term is -1x.  Take half its coefficient (-0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
-1x + 0.25 + x2 = 200 + 0.25

Reorder the terms:
0.25 + -1x + x2 = 200 + 0.25

Combine like terms: 200 + 0.25 = 200.25
0.25 + -1x + x2 = 200.25

Factor a perfect square on the left side:
(x + -0.5)(x + -0.5) = 200.25

Calculate the square root of the right side: 14.150971698

Break this problem into two subproblems by setting 
(x + -0.5) equal to 14.150971698 and -14.150971698.

Subproblem 1

x + -0.5 = 14.150971698 Simplifying x + -0.5 = 14.150971698 Reorder the terms: -0.5 + x = 14.150971698 Solving -0.5 + x = 14.150971698 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.5' to each side of the equation. -0.5 + 0.5 + x = 14.150971698 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + x = 14.150971698 + 0.5 x = 14.150971698 + 0.5 Combine like terms: 14.150971698 + 0.5 = 14.650971698 x = 14.650971698 Simplifying x = 14.650971698

Subproblem 2

x + -0.5 = -14.150971698 Simplifying x + -0.5 = -14.150971698 Reorder the terms: -0.5 + x = -14.150971698 Solving -0.5 + x = -14.150971698 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.5' to each side of the equation. -0.5 + 0.5 + x = -14.150971698 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + x = -14.150971698 + 0.5 x = -14.150971698 + 0.5 Combine like terms: -14.150971698 + 0.5 = -13.650971698 x = -13.650971698 Simplifying x = -13.650971698

Solution

The solution to the problem is based on the solutions from the subproblems. x = {14.650971698, -13.650971698}

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