x=36-x^2

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Solution for x=36-x^2 equation:


Simplifying
x = 36 + -1x2

Solving
x = 36 + -1x2

Solving for variable 'x'.

Reorder the terms:
-36 + x + x2 = 36 + -1x2 + -36 + x2

Reorder the terms:
-36 + x + x2 = 36 + -36 + -1x2 + x2

Combine like terms: 36 + -36 = 0
-36 + x + x2 = 0 + -1x2 + x2
-36 + x + x2 = -1x2 + x2

Combine like terms: -1x2 + x2 = 0
-36 + x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '36' to each side of the equation.
-36 + x + 36 + x2 = 0 + 36

Reorder the terms:
-36 + 36 + x + x2 = 0 + 36

Combine like terms: -36 + 36 = 0
0 + x + x2 = 0 + 36
x + x2 = 0 + 36

Combine like terms: 0 + 36 = 36
x + x2 = 36

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 = 36 + 0.25

Reorder the terms:
0.25 + x + x2 = 36 + 0.25

Combine like terms: 36 + 0.25 = 36.25
0.25 + x + x2 = 36.25

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 36.25

Calculate the square root of the right side: 6.020797289

Break this problem into two subproblems by setting 
(x + 0.5) equal to 6.020797289 and -6.020797289.

Subproblem 1

x + 0.5 = 6.020797289 Simplifying x + 0.5 = 6.020797289 Reorder the terms: 0.5 + x = 6.020797289 Solving 0.5 + x = 6.020797289 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 = 6.020797289 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 6.020797289 + -0.5 x = 6.020797289 + -0.5 Combine like terms: 6.020797289 + -0.5 = 5.520797289 x = 5.520797289 Simplifying x = 5.520797289

Subproblem 2

x + 0.5 = -6.020797289 Simplifying x + 0.5 = -6.020797289 Reorder the terms: 0.5 + x = -6.020797289 Solving 0.5 + x = -6.020797289 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 = -6.020797289 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -6.020797289 + -0.5 x = -6.020797289 + -0.5 Combine like terms: -6.020797289 + -0.5 = -6.520797289 x = -6.520797289 Simplifying x = -6.520797289

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.520797289, -6.520797289}

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