x^2-0.6x-0.55=0

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Solution for x^2-0.6x-0.55=0 equation:


Simplifying
x2 + -0.6x + -0.55 = 0

Reorder the terms:
-0.55 + -0.6x + x2 = 0

Solving
-0.55 + -0.6x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '0.55' to each side of the equation.
-0.55 + -0.6x + 0.55 + x2 = 0 + 0.55

Reorder the terms:
-0.55 + 0.55 + -0.6x + x2 = 0 + 0.55

Combine like terms: -0.55 + 0.55 = 0.00
0.00 + -0.6x + x2 = 0 + 0.55
-0.6x + x2 = 0 + 0.55

Combine like terms: 0 + 0.55 = 0.55
-0.6x + x2 = 0.55

The x term is -0.6x.  Take half its coefficient (-0.3).
Square it (0.09) and add it to both sides.

Add '0.09' to each side of the equation.
-0.6x + 0.09 + x2 = 0.55 + 0.09

Reorder the terms:
0.09 + -0.6x + x2 = 0.55 + 0.09

Combine like terms: 0.55 + 0.09 = 0.64
0.09 + -0.6x + x2 = 0.64

Factor a perfect square on the left side:
(x + -0.3)(x + -0.3) = 0.64

Calculate the square root of the right side: 0.8

Break this problem into two subproblems by setting 
(x + -0.3) equal to 0.8 and -0.8.

Subproblem 1

x + -0.3 = 0.8 Simplifying x + -0.3 = 0.8 Reorder the terms: -0.3 + x = 0.8 Solving -0.3 + x = 0.8 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.3' to each side of the equation. -0.3 + 0.3 + x = 0.8 + 0.3 Combine like terms: -0.3 + 0.3 = 0.0 0.0 + x = 0.8 + 0.3 x = 0.8 + 0.3 Combine like terms: 0.8 + 0.3 = 1.1 x = 1.1 Simplifying x = 1.1

Subproblem 2

x + -0.3 = -0.8 Simplifying x + -0.3 = -0.8 Reorder the terms: -0.3 + x = -0.8 Solving -0.3 + x = -0.8 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.3' to each side of the equation. -0.3 + 0.3 + x = -0.8 + 0.3 Combine like terms: -0.3 + 0.3 = 0.0 0.0 + x = -0.8 + 0.3 x = -0.8 + 0.3 Combine like terms: -0.8 + 0.3 = -0.5 x = -0.5 Simplifying x = -0.5

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.1, -0.5}

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