11x^2-2x-55=0

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Solution for 11x^2-2x-55=0 equation:


Simplifying
11x2 + -2x + -55 = 0

Reorder the terms:
-55 + -2x + 11x2 = 0

Solving
-55 + -2x + 11x2 = 0

Solving for variable 'x'.

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

Divide each side by '11'.
-5 + -0.1818181818x + x2 = 0

Move the constant term to the right:

Add '5' to each side of the equation.
-5 + -0.1818181818x + 5 + x2 = 0 + 5

Reorder the terms:
-5 + 5 + -0.1818181818x + x2 = 0 + 5

Combine like terms: -5 + 5 = 0
0 + -0.1818181818x + x2 = 0 + 5
-0.1818181818x + x2 = 0 + 5

Combine like terms: 0 + 5 = 5
-0.1818181818x + x2 = 5

The x term is -0.1818181818x.  Take half its coefficient (-0.0909090909).
Square it (0.008264462808) and add it to both sides.

Add '0.008264462808' to each side of the equation.
-0.1818181818x + 0.008264462808 + x2 = 5 + 0.008264462808

Reorder the terms:
0.008264462808 + -0.1818181818x + x2 = 5 + 0.008264462808

Combine like terms: 5 + 0.008264462808 = 5.008264462808
0.008264462808 + -0.1818181818x + x2 = 5.008264462808

Factor a perfect square on the left side:
(x + -0.0909090909)(x + -0.0909090909) = 5.008264462808

Calculate the square root of the right side: 2.237915205

Break this problem into two subproblems by setting 
(x + -0.0909090909) equal to 2.237915205 and -2.237915205.

Subproblem 1

x + -0.0909090909 = 2.237915205 Simplifying x + -0.0909090909 = 2.237915205 Reorder the terms: -0.0909090909 + x = 2.237915205 Solving -0.0909090909 + x = 2.237915205 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.0909090909' to each side of the equation. -0.0909090909 + 0.0909090909 + x = 2.237915205 + 0.0909090909 Combine like terms: -0.0909090909 + 0.0909090909 = 0.0000000000 0.0000000000 + x = 2.237915205 + 0.0909090909 x = 2.237915205 + 0.0909090909 Combine like terms: 2.237915205 + 0.0909090909 = 2.3288242959 x = 2.3288242959 Simplifying x = 2.3288242959

Subproblem 2

x + -0.0909090909 = -2.237915205 Simplifying x + -0.0909090909 = -2.237915205 Reorder the terms: -0.0909090909 + x = -2.237915205 Solving -0.0909090909 + x = -2.237915205 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.0909090909' to each side of the equation. -0.0909090909 + 0.0909090909 + x = -2.237915205 + 0.0909090909 Combine like terms: -0.0909090909 + 0.0909090909 = 0.0000000000 0.0000000000 + x = -2.237915205 + 0.0909090909 x = -2.237915205 + 0.0909090909 Combine like terms: -2.237915205 + 0.0909090909 = -2.1470061141 x = -2.1470061141 Simplifying x = -2.1470061141

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.3288242959, -2.1470061141}

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