x^2-x-199=0

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Solution for x^2-x-199=0 equation:


Simplifying
x2 + -1x + -199 = 0

Reorder the terms:
-199 + -1x + x2 = 0

Solving
-199 + -1x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '199' to each side of the equation.
-199 + -1x + 199 + x2 = 0 + 199

Reorder the terms:
-199 + 199 + -1x + x2 = 0 + 199

Combine like terms: -199 + 199 = 0
0 + -1x + x2 = 0 + 199
-1x + x2 = 0 + 199

Combine like terms: 0 + 199 = 199
-1x + x2 = 199

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 = 199 + 0.25

Reorder the terms:
0.25 + -1x + x2 = 199 + 0.25

Combine like terms: 199 + 0.25 = 199.25
0.25 + -1x + x2 = 199.25

Factor a perfect square on the left side:
(x + -0.5)(x + -0.5) = 199.25

Calculate the square root of the right side: 14.115594213

Break this problem into two subproblems by setting 
(x + -0.5) equal to 14.115594213 and -14.115594213.

Subproblem 1

x + -0.5 = 14.115594213 Simplifying x + -0.5 = 14.115594213 Reorder the terms: -0.5 + x = 14.115594213 Solving -0.5 + x = 14.115594213 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 = 14.115594213 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + x = 14.115594213 + 0.5 x = 14.115594213 + 0.5 Combine like terms: 14.115594213 + 0.5 = 14.615594213 x = 14.615594213 Simplifying x = 14.615594213

Subproblem 2

x + -0.5 = -14.115594213 Simplifying x + -0.5 = -14.115594213 Reorder the terms: -0.5 + x = -14.115594213 Solving -0.5 + x = -14.115594213 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 = -14.115594213 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + x = -14.115594213 + 0.5 x = -14.115594213 + 0.5 Combine like terms: -14.115594213 + 0.5 = -13.615594213 x = -13.615594213 Simplifying x = -13.615594213

Solution

The solution to the problem is based on the solutions from the subproblems. x = {14.615594213, -13.615594213}

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