x^2-.2x-2.2=0

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Solution for x^2-.2x-2.2=0 equation:


Simplifying
x2 + -0.2x + -2.2 = 0

Reorder the terms:
-2.2 + -0.2x + x2 = 0

Solving
-2.2 + -0.2x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '2.2' to each side of the equation.
-2.2 + -0.2x + 2.2 + x2 = 0 + 2.2

Reorder the terms:
-2.2 + 2.2 + -0.2x + x2 = 0 + 2.2

Combine like terms: -2.2 + 2.2 = 0.0
0.0 + -0.2x + x2 = 0 + 2.2
-0.2x + x2 = 0 + 2.2

Combine like terms: 0 + 2.2 = 2.2
-0.2x + x2 = 2.2

The x term is -0.2x.  Take half its coefficient (-0.1).
Square it (0.01) and add it to both sides.

Add '0.01' to each side of the equation.
-0.2x + 0.01 + x2 = 2.2 + 0.01

Reorder the terms:
0.01 + -0.2x + x2 = 2.2 + 0.01

Combine like terms: 2.2 + 0.01 = 2.21
0.01 + -0.2x + x2 = 2.21

Factor a perfect square on the left side:
(x + -0.1)(x + -0.1) = 2.21

Calculate the square root of the right side: 1.486606875

Break this problem into two subproblems by setting 
(x + -0.1) equal to 1.486606875 and -1.486606875.

Subproblem 1

x + -0.1 = 1.486606875 Simplifying x + -0.1 = 1.486606875 Reorder the terms: -0.1 + x = 1.486606875 Solving -0.1 + x = 1.486606875 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.1' to each side of the equation. -0.1 + 0.1 + x = 1.486606875 + 0.1 Combine like terms: -0.1 + 0.1 = 0.0 0.0 + x = 1.486606875 + 0.1 x = 1.486606875 + 0.1 Combine like terms: 1.486606875 + 0.1 = 1.586606875 x = 1.586606875 Simplifying x = 1.586606875

Subproblem 2

x + -0.1 = -1.486606875 Simplifying x + -0.1 = -1.486606875 Reorder the terms: -0.1 + x = -1.486606875 Solving -0.1 + x = -1.486606875 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.1' to each side of the equation. -0.1 + 0.1 + x = -1.486606875 + 0.1 Combine like terms: -0.1 + 0.1 = 0.0 0.0 + x = -1.486606875 + 0.1 x = -1.486606875 + 0.1 Combine like terms: -1.486606875 + 0.1 = -1.386606875 x = -1.386606875 Simplifying x = -1.386606875

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.586606875, -1.386606875}

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