x^2-x-208=0

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Solution for x^2-x-208=0 equation:


Simplifying
x2 + -1x + -208 = 0

Reorder the terms:
-208 + -1x + x2 = 0

Solving
-208 + -1x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '208' to each side of the equation.
-208 + -1x + 208 + x2 = 0 + 208

Reorder the terms:
-208 + 208 + -1x + x2 = 0 + 208

Combine like terms: -208 + 208 = 0
0 + -1x + x2 = 0 + 208
-1x + x2 = 0 + 208

Combine like terms: 0 + 208 = 208
-1x + x2 = 208

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 = 208 + 0.25

Reorder the terms:
0.25 + -1x + x2 = 208 + 0.25

Combine like terms: 208 + 0.25 = 208.25
0.25 + -1x + x2 = 208.25

Factor a perfect square on the left side:
(x + -0.5)(x + -0.5) = 208.25

Calculate the square root of the right side: 14.43086969

Break this problem into two subproblems by setting 
(x + -0.5) equal to 14.43086969 and -14.43086969.

Subproblem 1

x + -0.5 = 14.43086969 Simplifying x + -0.5 = 14.43086969 Reorder the terms: -0.5 + x = 14.43086969 Solving -0.5 + x = 14.43086969 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 = 14.43086969 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + x = 14.43086969 + 0.5 x = 14.43086969 + 0.5 Combine like terms: 14.43086969 + 0.5 = 14.93086969 x = 14.93086969 Simplifying x = 14.93086969

Subproblem 2

x + -0.5 = -14.43086969 Simplifying x + -0.5 = -14.43086969 Reorder the terms: -0.5 + x = -14.43086969 Solving -0.5 + x = -14.43086969 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 = -14.43086969 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + x = -14.43086969 + 0.5 x = -14.43086969 + 0.5 Combine like terms: -14.43086969 + 0.5 = -13.93086969 x = -13.93086969 Simplifying x = -13.93086969

Solution

The solution to the problem is based on the solutions from the subproblems. x = {14.93086969, -13.93086969}

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