5x^2-5.5x-5=0

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Solution for 5x^2-5.5x-5=0 equation:


Simplifying
5x2 + -5.5x + -5 = 0

Reorder the terms:
-5 + -5.5x + 5x2 = 0

Solving
-5 + -5.5x + 5x2 = 0

Solving for variable 'x'.

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

Divide each side by '5'.
-1 + -1.1x + x2 = 0

Move the constant term to the right:

Add '1' to each side of the equation.
-1 + -1.1x + 1 + x2 = 0 + 1

Reorder the terms:
-1 + 1 + -1.1x + x2 = 0 + 1

Combine like terms: -1 + 1 = 0
0 + -1.1x + x2 = 0 + 1
-1.1x + x2 = 0 + 1

Combine like terms: 0 + 1 = 1
-1.1x + x2 = 1

The x term is -1.1x.  Take half its coefficient (-0.55).
Square it (0.3025) and add it to both sides.

Add '0.3025' to each side of the equation.
-1.1x + 0.3025 + x2 = 1 + 0.3025

Reorder the terms:
0.3025 + -1.1x + x2 = 1 + 0.3025

Combine like terms: 1 + 0.3025 = 1.3025
0.3025 + -1.1x + x2 = 1.3025

Factor a perfect square on the left side:
(x + -0.55)(x + -0.55) = 1.3025

Calculate the square root of the right side: 1.141271221

Break this problem into two subproblems by setting 
(x + -0.55) equal to 1.141271221 and -1.141271221.

Subproblem 1

x + -0.55 = 1.141271221 Simplifying x + -0.55 = 1.141271221 Reorder the terms: -0.55 + x = 1.141271221 Solving -0.55 + x = 1.141271221 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.55' to each side of the equation. -0.55 + 0.55 + x = 1.141271221 + 0.55 Combine like terms: -0.55 + 0.55 = 0.00 0.00 + x = 1.141271221 + 0.55 x = 1.141271221 + 0.55 Combine like terms: 1.141271221 + 0.55 = 1.691271221 x = 1.691271221 Simplifying x = 1.691271221

Subproblem 2

x + -0.55 = -1.141271221 Simplifying x + -0.55 = -1.141271221 Reorder the terms: -0.55 + x = -1.141271221 Solving -0.55 + x = -1.141271221 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.55' to each side of the equation. -0.55 + 0.55 + x = -1.141271221 + 0.55 Combine like terms: -0.55 + 0.55 = 0.00 0.00 + x = -1.141271221 + 0.55 x = -1.141271221 + 0.55 Combine like terms: -1.141271221 + 0.55 = -0.591271221 x = -0.591271221 Simplifying x = -0.591271221

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.691271221, -0.591271221}

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