2x^2-22x-55=0

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Solution for 2x^2-22x-55=0 equation:


Simplifying
2x2 + -22x + -55 = 0

Reorder the terms:
-55 + -22x + 2x2 = 0

Solving
-55 + -22x + 2x2 = 0

Solving for variable 'x'.

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

Divide each side by '2'.
-27.5 + -11x + x2 = 0

Move the constant term to the right:

Add '27.5' to each side of the equation.
-27.5 + -11x + 27.5 + x2 = 0 + 27.5

Reorder the terms:
-27.5 + 27.5 + -11x + x2 = 0 + 27.5

Combine like terms: -27.5 + 27.5 = 0.0
0.0 + -11x + x2 = 0 + 27.5
-11x + x2 = 0 + 27.5

Combine like terms: 0 + 27.5 = 27.5
-11x + x2 = 27.5

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 = 27.5 + 30.25

Reorder the terms:
30.25 + -11x + x2 = 27.5 + 30.25

Combine like terms: 27.5 + 30.25 = 57.75
30.25 + -11x + x2 = 57.75

Factor a perfect square on the left side:
(x + -5.5)(x + -5.5) = 57.75

Calculate the square root of the right side: 7.599342077

Break this problem into two subproblems by setting 
(x + -5.5) equal to 7.599342077 and -7.599342077.

Subproblem 1

x + -5.5 = 7.599342077 Simplifying x + -5.5 = 7.599342077 Reorder the terms: -5.5 + x = 7.599342077 Solving -5.5 + x = 7.599342077 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 = 7.599342077 + 5.5 Combine like terms: -5.5 + 5.5 = 0.0 0.0 + x = 7.599342077 + 5.5 x = 7.599342077 + 5.5 Combine like terms: 7.599342077 + 5.5 = 13.099342077 x = 13.099342077 Simplifying x = 13.099342077

Subproblem 2

x + -5.5 = -7.599342077 Simplifying x + -5.5 = -7.599342077 Reorder the terms: -5.5 + x = -7.599342077 Solving -5.5 + x = -7.599342077 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 = -7.599342077 + 5.5 Combine like terms: -5.5 + 5.5 = 0.0 0.0 + x = -7.599342077 + 5.5 x = -7.599342077 + 5.5 Combine like terms: -7.599342077 + 5.5 = -2.099342077 x = -2.099342077 Simplifying x = -2.099342077

Solution

The solution to the problem is based on the solutions from the subproblems. x = {13.099342077, -2.099342077}

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