11x+x^2+20=0

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Solution for 11x+x^2+20=0 equation:


Simplifying
11x + x2 + 20 = 0

Reorder the terms:
20 + 11x + x2 = 0

Solving
20 + 11x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '-20' to each side of the equation.
20 + 11x + -20 + x2 = 0 + -20

Reorder the terms:
20 + -20 + 11x + x2 = 0 + -20

Combine like terms: 20 + -20 = 0
0 + 11x + x2 = 0 + -20
11x + x2 = 0 + -20

Combine like terms: 0 + -20 = -20
11x + x2 = -20

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 = -20 + 30.25

Reorder the terms:
30.25 + 11x + x2 = -20 + 30.25

Combine like terms: -20 + 30.25 = 10.25
30.25 + 11x + x2 = 10.25

Factor a perfect square on the left side:
(x + 5.5)(x + 5.5) = 10.25

Calculate the square root of the right side: 3.201562119

Break this problem into two subproblems by setting 
(x + 5.5) equal to 3.201562119 and -3.201562119.

Subproblem 1

x + 5.5 = 3.201562119 Simplifying x + 5.5 = 3.201562119 Reorder the terms: 5.5 + x = 3.201562119 Solving 5.5 + x = 3.201562119 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 = 3.201562119 + -5.5 Combine like terms: 5.5 + -5.5 = 0.0 0.0 + x = 3.201562119 + -5.5 x = 3.201562119 + -5.5 Combine like terms: 3.201562119 + -5.5 = -2.298437881 x = -2.298437881 Simplifying x = -2.298437881

Subproblem 2

x + 5.5 = -3.201562119 Simplifying x + 5.5 = -3.201562119 Reorder the terms: 5.5 + x = -3.201562119 Solving 5.5 + x = -3.201562119 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 = -3.201562119 + -5.5 Combine like terms: 5.5 + -5.5 = 0.0 0.0 + x = -3.201562119 + -5.5 x = -3.201562119 + -5.5 Combine like terms: -3.201562119 + -5.5 = -8.701562119 x = -8.701562119 Simplifying x = -8.701562119

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-2.298437881, -8.701562119}

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