x^2+11x=36

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Solution for x^2+11x=36 equation:


Simplifying
x2 + 11x = 36

Reorder the terms:
11x + x2 = 36

Solving
11x + x2 = 36

Solving for variable 'x'.

Reorder the terms:
-36 + 11x + x2 = 36 + -36

Combine like terms: 36 + -36 = 0
-36 + 11x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '36' to each side of the equation.
-36 + 11x + 36 + x2 = 0 + 36

Reorder the terms:
-36 + 36 + 11x + x2 = 0 + 36

Combine like terms: -36 + 36 = 0
0 + 11x + x2 = 0 + 36
11x + x2 = 0 + 36

Combine like terms: 0 + 36 = 36
11x + x2 = 36

The x term is 11x.  Take half its coefficient (5.5).
Square it (30.25) and add it to both sides.

Add '30.25' to each side of the equation.
11x + 30.25 + x2 = 36 + 30.25

Reorder the terms:
30.25 + 11x + x2 = 36 + 30.25

Combine like terms: 36 + 30.25 = 66.25
30.25 + 11x + x2 = 66.25

Factor a perfect square on the left side:
(x + 5.5)(x + 5.5) = 66.25

Calculate the square root of the right side: 8.139410298

Break this problem into two subproblems by setting 
(x + 5.5) equal to 8.139410298 and -8.139410298.

Subproblem 1

x + 5.5 = 8.139410298 Simplifying x + 5.5 = 8.139410298 Reorder the terms: 5.5 + x = 8.139410298 Solving 5.5 + x = 8.139410298 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5.5' to each side of the equation. 5.5 + -5.5 + x = 8.139410298 + -5.5 Combine like terms: 5.5 + -5.5 = 0.0 0.0 + x = 8.139410298 + -5.5 x = 8.139410298 + -5.5 Combine like terms: 8.139410298 + -5.5 = 2.639410298 x = 2.639410298 Simplifying x = 2.639410298

Subproblem 2

x + 5.5 = -8.139410298 Simplifying x + 5.5 = -8.139410298 Reorder the terms: 5.5 + x = -8.139410298 Solving 5.5 + x = -8.139410298 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5.5' to each side of the equation. 5.5 + -5.5 + x = -8.139410298 + -5.5 Combine like terms: 5.5 + -5.5 = 0.0 0.0 + x = -8.139410298 + -5.5 x = -8.139410298 + -5.5 Combine like terms: -8.139410298 + -5.5 = -13.639410298 x = -13.639410298 Simplifying x = -13.639410298

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.639410298, -13.639410298}

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