x^2-2x-165=0

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Solution for x^2-2x-165=0 equation:


Simplifying
x2 + -2x + -165 = 0

Reorder the terms:
-165 + -2x + x2 = 0

Solving
-165 + -2x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '165' to each side of the equation.
-165 + -2x + 165 + x2 = 0 + 165

Reorder the terms:
-165 + 165 + -2x + x2 = 0 + 165

Combine like terms: -165 + 165 = 0
0 + -2x + x2 = 0 + 165
-2x + x2 = 0 + 165

Combine like terms: 0 + 165 = 165
-2x + x2 = 165

The x term is -2x.  Take half its coefficient (-1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
-2x + 1 + x2 = 165 + 1

Reorder the terms:
1 + -2x + x2 = 165 + 1

Combine like terms: 165 + 1 = 166
1 + -2x + x2 = 166

Factor a perfect square on the left side:
(x + -1)(x + -1) = 166

Calculate the square root of the right side: 12.884098727

Break this problem into two subproblems by setting 
(x + -1) equal to 12.884098727 and -12.884098727.

Subproblem 1

x + -1 = 12.884098727 Simplifying x + -1 = 12.884098727 Reorder the terms: -1 + x = 12.884098727 Solving -1 + x = 12.884098727 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + x = 12.884098727 + 1 Combine like terms: -1 + 1 = 0 0 + x = 12.884098727 + 1 x = 12.884098727 + 1 Combine like terms: 12.884098727 + 1 = 13.884098727 x = 13.884098727 Simplifying x = 13.884098727

Subproblem 2

x + -1 = -12.884098727 Simplifying x + -1 = -12.884098727 Reorder the terms: -1 + x = -12.884098727 Solving -1 + x = -12.884098727 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + x = -12.884098727 + 1 Combine like terms: -1 + 1 = 0 0 + x = -12.884098727 + 1 x = -12.884098727 + 1 Combine like terms: -12.884098727 + 1 = -11.884098727 x = -11.884098727 Simplifying x = -11.884098727

Solution

The solution to the problem is based on the solutions from the subproblems. x = {13.884098727, -11.884098727}

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