x(9-x)+2x=-6

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Solution for x(9-x)+2x=-6 equation:


Simplifying
x(9 + -1x) + 2x = -6
(9 * x + -1x * x) + 2x = -6
(9x + -1x2) + 2x = -6

Reorder the terms:
9x + 2x + -1x2 = -6

Combine like terms: 9x + 2x = 11x
11x + -1x2 = -6

Solving
11x + -1x2 = -6

Solving for variable 'x'.

Reorder the terms:
6 + 11x + -1x2 = -6 + 6

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

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

Divide each side by '-1'.
-6 + -11x + x2 = 0

Move the constant term to the right:

Add '6' to each side of the equation.
-6 + -11x + 6 + x2 = 0 + 6

Reorder the terms:
-6 + 6 + -11x + x2 = 0 + 6

Combine like terms: -6 + 6 = 0
0 + -11x + x2 = 0 + 6
-11x + x2 = 0 + 6

Combine like terms: 0 + 6 = 6
-11x + x2 = 6

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 = 6 + 30.25

Reorder the terms:
30.25 + -11x + x2 = 6 + 30.25

Combine like terms: 6 + 30.25 = 36.25
30.25 + -11x + x2 = 36.25

Factor a perfect square on the left side:
(x + -5.5)(x + -5.5) = 36.25

Calculate the square root of the right side: 6.020797289

Break this problem into two subproblems by setting 
(x + -5.5) equal to 6.020797289 and -6.020797289.

Subproblem 1

x + -5.5 = 6.020797289 Simplifying x + -5.5 = 6.020797289 Reorder the terms: -5.5 + x = 6.020797289 Solving -5.5 + x = 6.020797289 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 = 6.020797289 + 5.5 Combine like terms: -5.5 + 5.5 = 0.0 0.0 + x = 6.020797289 + 5.5 x = 6.020797289 + 5.5 Combine like terms: 6.020797289 + 5.5 = 11.520797289 x = 11.520797289 Simplifying x = 11.520797289

Subproblem 2

x + -5.5 = -6.020797289 Simplifying x + -5.5 = -6.020797289 Reorder the terms: -5.5 + x = -6.020797289 Solving -5.5 + x = -6.020797289 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 = -6.020797289 + 5.5 Combine like terms: -5.5 + 5.5 = 0.0 0.0 + x = -6.020797289 + 5.5 x = -6.020797289 + 5.5 Combine like terms: -6.020797289 + 5.5 = -0.520797289 x = -0.520797289 Simplifying x = -0.520797289

Solution

The solution to the problem is based on the solutions from the subproblems. x = {11.520797289, -0.520797289}

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