x^2-165+x=0

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


Simplifying
x2 + -165 + x = 0

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

Solving
-165 + x + 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 + x + 165 + x2 = 0 + 165

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

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

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

The x term is x.  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.
x + 0.25 + x2 = 165 + 0.25

Reorder the terms:
0.25 + x + x2 = 165 + 0.25

Combine like terms: 165 + 0.25 = 165.25
0.25 + x + x2 = 165.25

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 165.25

Calculate the square root of the right side: 12.854960132

Break this problem into two subproblems by setting 
(x + 0.5) equal to 12.854960132 and -12.854960132.

Subproblem 1

x + 0.5 = 12.854960132 Simplifying x + 0.5 = 12.854960132 Reorder the terms: 0.5 + x = 12.854960132 Solving 0.5 + x = 12.854960132 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 = 12.854960132 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 12.854960132 + -0.5 x = 12.854960132 + -0.5 Combine like terms: 12.854960132 + -0.5 = 12.354960132 x = 12.354960132 Simplifying x = 12.354960132

Subproblem 2

x + 0.5 = -12.854960132 Simplifying x + 0.5 = -12.854960132 Reorder the terms: 0.5 + x = -12.854960132 Solving 0.5 + x = -12.854960132 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 = -12.854960132 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -12.854960132 + -0.5 x = -12.854960132 + -0.5 Combine like terms: -12.854960132 + -0.5 = -13.354960132 x = -13.354960132 Simplifying x = -13.354960132

Solution

The solution to the problem is based on the solutions from the subproblems. x = {12.354960132, -13.354960132}

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