x^2+x=135

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Solution for x^2+x=135 equation:


Simplifying
x2 + x = 135

Reorder the terms:
x + x2 = 135

Solving
x + x2 = 135

Solving for variable 'x'.

Reorder the terms:
-135 + x + x2 = 135 + -135

Combine like terms: 135 + -135 = 0
-135 + x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '135' to each side of the equation.
-135 + x + 135 + x2 = 0 + 135

Reorder the terms:
-135 + 135 + x + x2 = 0 + 135

Combine like terms: -135 + 135 = 0
0 + x + x2 = 0 + 135
x + x2 = 0 + 135

Combine like terms: 0 + 135 = 135
x + x2 = 135

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 = 135 + 0.25

Reorder the terms:
0.25 + x + x2 = 135 + 0.25

Combine like terms: 135 + 0.25 = 135.25
0.25 + x + x2 = 135.25

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 135.25

Calculate the square root of the right side: 11.62970335

Break this problem into two subproblems by setting 
(x + 0.5) equal to 11.62970335 and -11.62970335.

Subproblem 1

x + 0.5 = 11.62970335 Simplifying x + 0.5 = 11.62970335 Reorder the terms: 0.5 + x = 11.62970335 Solving 0.5 + x = 11.62970335 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 = 11.62970335 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 11.62970335 + -0.5 x = 11.62970335 + -0.5 Combine like terms: 11.62970335 + -0.5 = 11.12970335 x = 11.12970335 Simplifying x = 11.12970335

Subproblem 2

x + 0.5 = -11.62970335 Simplifying x + 0.5 = -11.62970335 Reorder the terms: 0.5 + x = -11.62970335 Solving 0.5 + x = -11.62970335 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 = -11.62970335 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -11.62970335 + -0.5 x = -11.62970335 + -0.5 Combine like terms: -11.62970335 + -0.5 = -12.12970335 x = -12.12970335 Simplifying x = -12.12970335

Solution

The solution to the problem is based on the solutions from the subproblems. x = {11.12970335, -12.12970335}

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