x^2+11x=-4

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Solution for x^2+11x=-4 equation:


Simplifying
x2 + 11x = -4

Reorder the terms:
11x + x2 = -4

Solving
11x + x2 = -4

Solving for variable 'x'.

Reorder the terms:
4 + 11x + x2 = -4 + 4

Combine like terms: -4 + 4 = 0
4 + 11x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-4' to each side of the equation.
4 + 11x + -4 + x2 = 0 + -4

Reorder the terms:
4 + -4 + 11x + x2 = 0 + -4

Combine like terms: 4 + -4 = 0
0 + 11x + x2 = 0 + -4
11x + x2 = 0 + -4

Combine like terms: 0 + -4 = -4
11x + x2 = -4

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 = -4 + 30.25

Reorder the terms:
30.25 + 11x + x2 = -4 + 30.25

Combine like terms: -4 + 30.25 = 26.25
30.25 + 11x + x2 = 26.25

Factor a perfect square on the left side:
(x + 5.5)(x + 5.5) = 26.25

Calculate the square root of the right side: 5.123475383

Break this problem into two subproblems by setting 
(x + 5.5) equal to 5.123475383 and -5.123475383.

Subproblem 1

x + 5.5 = 5.123475383 Simplifying x + 5.5 = 5.123475383 Reorder the terms: 5.5 + x = 5.123475383 Solving 5.5 + x = 5.123475383 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 = 5.123475383 + -5.5 Combine like terms: 5.5 + -5.5 = 0.0 0.0 + x = 5.123475383 + -5.5 x = 5.123475383 + -5.5 Combine like terms: 5.123475383 + -5.5 = -0.376524617 x = -0.376524617 Simplifying x = -0.376524617

Subproblem 2

x + 5.5 = -5.123475383 Simplifying x + 5.5 = -5.123475383 Reorder the terms: 5.5 + x = -5.123475383 Solving 5.5 + x = -5.123475383 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 = -5.123475383 + -5.5 Combine like terms: 5.5 + -5.5 = 0.0 0.0 + x = -5.123475383 + -5.5 x = -5.123475383 + -5.5 Combine like terms: -5.123475383 + -5.5 = -10.623475383 x = -10.623475383 Simplifying x = -10.623475383

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.376524617, -10.623475383}

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