(6-x)(x+6)-(x-11)=36

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Solution for (6-x)(x+6)-(x-11)=36 equation:


Simplifying
(6 + -1x)(x + 6) + -1(x + -11) = 36

Reorder the terms:
(6 + -1x)(6 + x) + -1(x + -11) = 36

Multiply (6 + -1x) * (6 + x)
(6(6 + x) + -1x * (6 + x)) + -1(x + -11) = 36
((6 * 6 + x * 6) + -1x * (6 + x)) + -1(x + -11) = 36
((36 + 6x) + -1x * (6 + x)) + -1(x + -11) = 36
(36 + 6x + (6 * -1x + x * -1x)) + -1(x + -11) = 36
(36 + 6x + (-6x + -1x2)) + -1(x + -11) = 36

Combine like terms: 6x + -6x = 0
(36 + 0 + -1x2) + -1(x + -11) = 36
(36 + -1x2) + -1(x + -11) = 36

Reorder the terms:
36 + -1x2 + -1(-11 + x) = 36
36 + -1x2 + (-11 * -1 + x * -1) = 36
36 + -1x2 + (11 + -1x) = 36

Reorder the terms:
36 + 11 + -1x + -1x2 = 36

Combine like terms: 36 + 11 = 47
47 + -1x + -1x2 = 36

Solving
47 + -1x + -1x2 = 36

Solving for variable 'x'.

Reorder the terms:
47 + -36 + -1x + -1x2 = 36 + -36

Combine like terms: 47 + -36 = 11
11 + -1x + -1x2 = 36 + -36

Combine like terms: 36 + -36 = 0
11 + -1x + -1x2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-11 + x + x2 = 0

Move the constant term to the right:

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

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

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

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

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.
 + 0.25 + x2 = 11 + 0.25

Combine like terms:  + 0.25 = 1.25
1.25 + x2 = 11 + 0.25

Combine like terms: 11 + 0.25 = 11.25
1.25 + x2 = 11.25

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 11.25

Calculate the square root of the right side: 3.354101966

Break this problem into two subproblems by setting 
(x + 0.5) equal to 3.354101966 and -3.354101966.

Subproblem 1

x + 0.5 = 3.354101966 Simplifying x + 0.5 = 3.354101966 Reorder the terms: 0.5 + x = 3.354101966 Solving 0.5 + x = 3.354101966 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 = 3.354101966 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 3.354101966 + -0.5 x = 3.354101966 + -0.5 Combine like terms: 3.354101966 + -0.5 = 2.854101966 x = 2.854101966 Simplifying x = 2.854101966

Subproblem 2

x + 0.5 = -3.354101966 Simplifying x + 0.5 = -3.354101966 Reorder the terms: 0.5 + x = -3.354101966 Solving 0.5 + x = -3.354101966 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 = -3.354101966 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -3.354101966 + -0.5 x = -3.354101966 + -0.5 Combine like terms: -3.354101966 + -0.5 = -3.854101966 x = -3.854101966 Simplifying x = -3.854101966

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.854101966, -3.854101966}

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