x-13x^2+36=0

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Solution for x-13x^2+36=0 equation:


Simplifying
x + -13x2 + 36 = 0

Reorder the terms:
36 + x + -13x2 = 0

Solving
36 + x + -13x2 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
-13 the coefficient of the squared term: 

Divide each side by '-13'.
-2.769230769 + -0.07692307692x + x2 = 0

Move the constant term to the right:

Add '2.769230769' to each side of the equation.
-2.769230769 + -0.07692307692x + 2.769230769 + x2 = 0 + 2.769230769

Reorder the terms:
-2.769230769 + 2.769230769 + -0.07692307692x + x2 = 0 + 2.769230769

Combine like terms: -2.769230769 + 2.769230769 = 0.000000000
0.000000000 + -0.07692307692x + x2 = 0 + 2.769230769
-0.07692307692x + x2 = 0 + 2.769230769

Combine like terms: 0 + 2.769230769 = 2.769230769
-0.07692307692x + x2 = 2.769230769

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.
-0.07692307692x + 0.25 + x2 = 2.769230769 + 0.25

Reorder the terms:
0.25 + -0.07692307692x + x2 = 2.769230769 + 0.25

Combine like terms: 2.769230769 + 0.25 = 3.019230769
0.25 + -0.07692307692x + x2 = 3.019230769

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 3.019230769

Calculate the square root of the right side: 1.737593384

Break this problem into two subproblems by setting 
(x + 0.5) equal to 1.737593384 and -1.737593384.

Subproblem 1

x + 0.5 = 1.737593384 Simplifying x + 0.5 = 1.737593384 Reorder the terms: 0.5 + x = 1.737593384 Solving 0.5 + x = 1.737593384 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 = 1.737593384 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 1.737593384 + -0.5 x = 1.737593384 + -0.5 Combine like terms: 1.737593384 + -0.5 = 1.237593384 x = 1.237593384 Simplifying x = 1.237593384

Subproblem 2

x + 0.5 = -1.737593384 Simplifying x + 0.5 = -1.737593384 Reorder the terms: 0.5 + x = -1.737593384 Solving 0.5 + x = -1.737593384 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 = -1.737593384 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -1.737593384 + -0.5 x = -1.737593384 + -0.5 Combine like terms: -1.737593384 + -0.5 = -2.237593384 x = -2.237593384 Simplifying x = -2.237593384

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.237593384, -2.237593384}

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