11x=-x^2-8

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Solution for 11x=-x^2-8 equation:


Simplifying
11x = -1x2 + -8

Reorder the terms:
11x = -8 + -1x2

Solving
11x = -8 + -1x2

Solving for variable 'x'.

Reorder the terms:
8 + 11x + x2 = -8 + -1x2 + 8 + x2

Reorder the terms:
8 + 11x + x2 = -8 + 8 + -1x2 + x2

Combine like terms: -8 + 8 = 0
8 + 11x + x2 = 0 + -1x2 + x2
8 + 11x + x2 = -1x2 + x2

Combine like terms: -1x2 + x2 = 0
8 + 11x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-8' to each side of the equation.
8 + 11x + -8 + x2 = 0 + -8

Reorder the terms:
8 + -8 + 11x + x2 = 0 + -8

Combine like terms: 8 + -8 = 0
0 + 11x + x2 = 0 + -8
11x + x2 = 0 + -8

Combine like terms: 0 + -8 = -8
11x + x2 = -8

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 = -8 + 30.25

Reorder the terms:
30.25 + 11x + x2 = -8 + 30.25

Combine like terms: -8 + 30.25 = 22.25
30.25 + 11x + x2 = 22.25

Factor a perfect square on the left side:
(x + 5.5)(x + 5.5) = 22.25

Calculate the square root of the right side: 4.716990566

Break this problem into two subproblems by setting 
(x + 5.5) equal to 4.716990566 and -4.716990566.

Subproblem 1

x + 5.5 = 4.716990566 Simplifying x + 5.5 = 4.716990566 Reorder the terms: 5.5 + x = 4.716990566 Solving 5.5 + x = 4.716990566 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 = 4.716990566 + -5.5 Combine like terms: 5.5 + -5.5 = 0.0 0.0 + x = 4.716990566 + -5.5 x = 4.716990566 + -5.5 Combine like terms: 4.716990566 + -5.5 = -0.783009434 x = -0.783009434 Simplifying x = -0.783009434

Subproblem 2

x + 5.5 = -4.716990566 Simplifying x + 5.5 = -4.716990566 Reorder the terms: 5.5 + x = -4.716990566 Solving 5.5 + x = -4.716990566 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 = -4.716990566 + -5.5 Combine like terms: 5.5 + -5.5 = 0.0 0.0 + x = -4.716990566 + -5.5 x = -4.716990566 + -5.5 Combine like terms: -4.716990566 + -5.5 = -10.216990566 x = -10.216990566 Simplifying x = -10.216990566

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.783009434, -10.216990566}

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