x^2+22x=-16

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Solution for x^2+22x=-16 equation:


Simplifying
x2 + 22x = -16

Reorder the terms:
22x + x2 = -16

Solving
22x + x2 = -16

Solving for variable 'x'.

Reorder the terms:
16 + 22x + x2 = -16 + 16

Combine like terms: -16 + 16 = 0
16 + 22x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-16' to each side of the equation.
16 + 22x + -16 + x2 = 0 + -16

Reorder the terms:
16 + -16 + 22x + x2 = 0 + -16

Combine like terms: 16 + -16 = 0
0 + 22x + x2 = 0 + -16
22x + x2 = 0 + -16

Combine like terms: 0 + -16 = -16
22x + x2 = -16

The x term is 22x.  Take half its coefficient (11).
Square it (121) and add it to both sides.

Add '121' to each side of the equation.
22x + 121 + x2 = -16 + 121

Reorder the terms:
121 + 22x + x2 = -16 + 121

Combine like terms: -16 + 121 = 105
121 + 22x + x2 = 105

Factor a perfect square on the left side:
(x + 11)(x + 11) = 105

Calculate the square root of the right side: 10.246950766

Break this problem into two subproblems by setting 
(x + 11) equal to 10.246950766 and -10.246950766.

Subproblem 1

x + 11 = 10.246950766 Simplifying x + 11 = 10.246950766 Reorder the terms: 11 + x = 10.246950766 Solving 11 + x = 10.246950766 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-11' to each side of the equation. 11 + -11 + x = 10.246950766 + -11 Combine like terms: 11 + -11 = 0 0 + x = 10.246950766 + -11 x = 10.246950766 + -11 Combine like terms: 10.246950766 + -11 = -0.753049234 x = -0.753049234 Simplifying x = -0.753049234

Subproblem 2

x + 11 = -10.246950766 Simplifying x + 11 = -10.246950766 Reorder the terms: 11 + x = -10.246950766 Solving 11 + x = -10.246950766 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-11' to each side of the equation. 11 + -11 + x = -10.246950766 + -11 Combine like terms: 11 + -11 = 0 0 + x = -10.246950766 + -11 x = -10.246950766 + -11 Combine like terms: -10.246950766 + -11 = -21.246950766 x = -21.246950766 Simplifying x = -21.246950766

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.753049234, -21.246950766}

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